In my last post, we left off our acoustics 101 with the emergence of the first modern echosounders in the 1990s. Today, we will look at the current system aboard Oscar Dyson and learn how the science team can use their knowledge of acoustics to estimate fish populations. First, let’s look at the physical components that make up the EK80 echosounder system.
Each frequency requires its own transceiver. These six transceivers are the heart of the EK80 echosounder.
Transceiver – a combination of a transmitter and a receiver; in other words, it both produces an electrical pulse to be sent to the transducer and converts the backscattered signal into usable data a computer can understand. You can think of the transceiver as the electronic brain that manages all of the signal inputs and outputs.
Transducer – Just like you might plug a microphone into your laptop to record audio, each transceiver needs a transducer to first convert the electrical pulse into an acoustic pulse that is transmitted into the water, and to measure the acoustic backscatter that returns. You can actually see the transducers in the photo of the centerboard below. The transceivers measure frequencies ranging from 18 kHz (those really annoying mosquito ringtones that only young people can hear are around 18 kHz) to 330 kHz.
A) The red circles on the bottom of the centerboard are the faces of the transducers. These sensitive instruments are mounted at the lowest point of the ship to isolate them from the vessel’s noisy hull. B) The acoustic centerboard protrudes well below the noisy hull-water interface.
The Echogram
Once the transceivers process the acoustic backscatter, the data is displayed on a screen for interpretation.
There’s quite a lot going on here! Let’s break it down into smaller pieces so we can learn to look at the data like a scientist.Each of the six frequencies appears as a vertical section that scrolls from right to left as the vessel moves. The top of each plot represents the ocean surface, and the thick red layer near the bottom shows the seafloor. The space in between lets us look at what is below the ship! Weak backscatter appears blue; stronger backscatter appears yellow and even red.
Our old friend munge is making an appearance in this echogram! It is the heavy backscatter layer just beneath the surface that is strongest at 18 kHz. Lower in the water column, we see that most backscatter occurs at higher frequencies, with only sparse backscatter in the lower-frequency plots. Backscatter that is observed only at higher frequencies indicates smaller organisms, such as krill or copepods. Backscatter that appears across all frequencies is likely generated by fish.
As you spend more time looking at this scrolling echogram, you can begin to recognize patterns and draw reasonable inferences. Below are some examples of the variety you can see in just a few hours in the cave.
Younger pollock can gather in schools 20-40 meters tall that appear as very thin red ellipses.You can clearly see occasional reflectors on the 18 & 38 kHz channels; these may well correspond to adult fish. The only way to be certain is to trawl in an area that looks like this and see what the net brings up!We know that large fish like pollock return a relatively even acoustic signal across every channel that we look at; there do not appear to be any significant pelagic fish present in this echogram.
Now that we can read echograms, we are ready to call for our first trawl! Come back next time to see what we data we can scoop up in “The Anatomy of a Midwater Trawl”.
Personal Log
Things aboard Oscar Dyson have settled into a routine. We travel along acoustic transects during daylight hours, stopping 2-3 times a day to do a midwater trawl. Routine doesn’t mean boring, though! Maintaining a ship of this size and complexity is more than enough to keep everyone busy. The checklist for this leg included checking on the smaller craft that service and support Oscar Dyson on her mission. Conditions cleared on 06/29, and the Peggy D, the workboat that lives on the starboard hero deck, was given a thorough check and taken for a 30-minute voyage.
Peggy D secured to the aft hero deck of Oscar Dyson. ENG Connor Rauch and ENG Chelsea Gostomski on the aft deck of Peggy D.LCDR LeeAnn Keener and I enjoying the scenery.Bosun Alex Steele instructs me in the safe operation of Peggy D.
Safety drills and practice are a part of the routine as well. ENGR Connor Rauch practices recovery during a man-overboard drill on Peggy D. In the case of an actual man overboard, the smaller vessels are used for recovery, as they can respond much more nimbly and are far safer in close quarters with a swimmer.
Wildlife
This smooth lumpsucker (Aptocyclus ventricosus) is just as surprised to see me as I am to see him.Lumpsuckers have a unique feature: a ventral suction disk that allows them to firmly attach themselves to rocks in rough conditions.
Before stepping aboard NOAA Ship Thomas Jefferson, I assumed most of the crew would be scientists. While hydrography is certainly at the heart of the mission, I learned that it takes professionals from many different career fields to keep the ship operating safely and efficiently. In fact, many of the jobs on board connect directly to the career pathways offered where I teach, Pickaway-Ross Career & Technology Center.
PRCTC’s list of programs (Credit: PRCTC)
The survey technicians are responsible for collecting and processing hydrographic data using multibeam sonar, side-scan sonar, GPS, and specialized computer software. Their work combines engineering technology, robotics, and cyber security & networking.
The deck department operates cranes and davits, launches and recovers the survey boats, performs maintenance, handles lines during docking, and ensures the safe operation of the vessel. These careers require technical skills, teamwork, problem-solving, and attention to safety which are qualities developed through career and technical education programs. Especially since we train our students in Lean Six Sigma.
Bosun Alex Bischoff helping 2904 crew aboard
Behind the scenes, the engineering department keeps the ship running 24 hours a day. Engineers maintain the propulsion systems, generators, pumps, electrical systems, and countless pieces of equipment that allow the Thomas Jefferson to complete its mission. Students pursuing careers in diesel technology, industrial maintenance, electrical trades, or advanced manufacturing would recognize many of the same hands-on skills used every day aboard ship.
The bridge is staffed by NOAA Corps officers, who are responsible for safely navigating the ship, supervising survey operations, managing personnel, and making operational decisions. Their careers combine leadership with navigation, meteorology, technology, project management and safety. These officers work very similarly to the students in the Public Safety course at PRCTC.
Officers working the bridge on NOAA Ship Thomas Jefferson
Even the steward department plays a vital role. Preparing three meals a day for a crew working long hours requires planning, organization, food safety knowledge, inventory management, and culinary skills. The galley keeps morale high and ensures everyone has the energy needed to perform demanding work much like our commercial foods program.
The Thomas Jefferson also relies on electronics, communications, information technology, logistics, administration, and medical support. Every member of the crew contributes specialized skills that allow the ship to operate as a single, coordinated team.
One of the biggest takeaways from this experience is that there isn’t just one pathway to working aboard a ship like the Thomas Jefferson. Whether your interests are welding, diesel technology, engineering, information technology, culinary arts, electronics, leadership, or science, there is a place where those skills can make a difference.
As a teacher at Pickaway-Ross CTC, this experience has given me real-world examples to bring back to my classroom. Now I can point to an entire ship where technical skills, problem-solving, teamwork, and communication are used every single day. Career and technical education doesn’t just prepare students for jobs, it also prepares them for opportunities they may have never imagined, including serving aboard a NOAA hydrographic survey vessel.
Clearing the Way
While the NOAA Ship Thomas Jefferson is best known for charting U.S. waters, the ship can also play a critical role in responding to natural disasters.
In 2017, after Hurricane Maria devastated Puerto Rico and the U.S. Virgin Islands, the Thomas Jefferson was deployed to help restore safe navigation to the region. Using its multibeam sonar and side-scan sonar systems, the crew surveyed ports and waterways to identify underwater hazards and ensure safe passage for the U.S. Coast Guard, relief vessels, and other emergency responders. Because so many essential supplies reach the islands through these ports, reopening them quickly was vital to the recovery effort.
Over the course of just three weeks, the Thomas Jefferson surveyed 13 areas, including more than 18 ports, helping authorities safely resume maritime traffic.
Areas surveyed by NOAA Ship Thomas Jefferson after Huricane Maria in 2017 (Credit: NOAA)
One of the ship’s greatest strengths is its ability to operate independently. With a crew of 38, the Thomas Jefferson can remain at sea for several weeks without relying on outside support, making it an ideal platform for extended emergency response missions. Its two survey launches, 2903 and 2904, further enhance its capabilities by allowing crews to survey shallow waters and areas where storm debris may have accumulated.
Learning about the Thomas Jefferson‘s role after Hurricane Maria gave me a broader perspective on hydrography. Before this experience, I mainly associated nautical charting with supporting everyday navigation. Seeing how these same surveying skills and technologies can be used to assess storm damage, clear ports, and help restore critical shipping routes showed me just how important this work is. It is another example of how the crew’s expertise extends far beyond routine charting operations.
Personal Log
Unfortunately, I am on my way home. However, I want to share a few last memories from this experience.
The Crew’s Greatest Challenge
I had started to think the crew aboard the Thomas Jefferson was almost flawless, then game night happened.
Communication on the bridge during unfavorable conditions is exceptional. Navigating video games? Not so much.
Crew working on their communication skills during game night
The Commanding Officer remained calm, cool, and collected through two weeks of transiting the Welland Canal, changing weather, and demanding survey operations. Yet during game night, I caught a glimpse of what looked like a silent question in the CO’s eyes: “Is this really my crew?” as everyone demonstrated their less-than-stellar teamwork in a video game. I also learned that it is, in fact, possible to earn negative points.
The evening was filled with unforgettable comments like, “I have steak on the starboard quarter!” followed by, “Fish pasta, aye!” and “Who keeps putting the fire extinguisher on the stove?” Somehow, those made perfect sense in the middle of the chaos. And no game night would be complete without a few “passionate” debates over the official rules of Scrabble.
Crew demonstrating teamwork skills during game night
As entertaining as the games were, my favorite part was seeing this side of the crew. After watching them work with such precision and professionalism every day, it was refreshing to see the Commanding Officer and Executive Officer relax alongside everyone else. For a few hours, ranks took a back seat to friendly competition, laughter, and good-natured teasing. It was a wonderful reminder that the strong teamwork I had witnessed throughout the mission is built not only through hard work, but also through shared moments like these.
Crew of NOAA Ship Thomas Jefferson at game night
Sharing the Mission
An exciting part of my journey home was getting the chance to share my experience aboard the Thomas Jefferson with people I met along the way. My Uber driver and the hotel front desk attendant were both curious about why I had been on a NOAA ship, which gave me the opportunity to explain the mission of the Thomas Jefferson and the important work the crew does to create accurate nautical charts and ensure safe navigation. They both had said they had lived here all their lives and never saw a boat like that in the port or knew that the lake was not surveyed. After spending time with the crew, I found myself proudly talking about their work and the dedication it takes to accomplish such an important mission.
Mission Complete
I want to extend my sincere thanks to Commanding Officer Kidd and Executive Officer Duffy for welcoming me aboard and giving me the opportunity to be part of this incredible experience.
I also want to thank the entire crew for making me feel at home from day one. Everyone was so welcoming, patient, and willing to answer my endless questions. A special thank you goes to the survey technicians, who took the time to explain everything to me slowly and more than once when needed. Their patience and enthusiasm for their work made it easy to appreciate the science and technology behind every survey.
Chief Scientist Sarah Thompson explaining the Sea-Bird CTD proceedures
I also want to thank my roommate, Junior Officer Bridget Ruiz, for making life aboard so enjoyable. Thank you for your friendship, the great conversations, and for making me feel at home while we were at sea. Sharing this adventure with you made the experience even more memorable.
I feel incredibly fortunate to have been assigned to NOAA Ship Thomas Jefferson. I have a much deeper appreciation for the important work this crew does. More importantly, I am returning home excited to share what I have learned with my students. I hope that through these stories, they will discover careers they may have never considered and see that science can lead to adventures far beyond the classroom.
Fair winds and following seas, Thomas Jefferson. Thank you for an unforgettable journey.
So, we’ve taken a chilly dive into the why behind the focus on the pollock. Today, I will take you into “The Cave,” where we can learn how scientists use sound to locate and count pollock. On the port side of the main deck sits a dark, windowless room lit only by the dozen or so monitors adorning its aft wall. A gentle, constant humming fills the room from racks and racks of electronics, servers, and support equipment that dominate the center of this space. While the OOD on the bridge steers this vessel, “The Cave” calls the scientific shots by determining the ship’s course as well as the timing and location of all science operations.
Abigail McCarthy and Mike Levine discuss plans for the day shift. Time at sea is precious; this vessel operates 24/7 in all conditions. For the past two days, a very quiet, fishless northern extension has limited opportunities. But remember, even a null result is a result!
Acoustics 101
Since the early 20th century, scientists have used the unique ability of sound waves to transmit very efficiently through water for remote sensing. “Pings” of acoustic energy are generated by a transmitter, and then the backscatter (or reflected sound) is detected by a receiver. Early pioneers used sonar to better understand the physical geography of ocean basins in a process called bathymetry.
USS Stewart first tested an early form of echosounder in 1922 as part of preparations for the installation of the Transatlantic cable.
Not long after the first echosounders made their way aboard ships, scientists realized that as the quality of the instrument increased, they could measure the backscatter (or reflected sound) off of other objects besides the seafloor. Large backscattering layers far above the seafloor were targeted by fishing vessels using the new technology, demonstrating the effectiveness of echosounders at locating marine organisms throughout the water column.
Early innovators in Norway and England reported success in using echosounders to detect large schools of fish and began actively monitoring their behavior (Balls, 1948).
The following decades of acoustic research relied on analog, single-beam systems, which were often towed behind or below a vessel and recorded a narrow swath directly below the ship onto a paper echogram.
A 3d porcelain rendering of this now-famous echogram (the recorded chart of an echosounder) from the Shelikof Straight adorns the entry to the NOAA Alaska Fisheries Science Center in Seattle. The strong red and yellow reflections that sweep gently across the bottom represent the strong backscatter from the seafloor, and the large red cloud represents a large school of pollock.
The 1990’s welcomed a new era in echosounder technology with the release of the SIMRAD EK-500. This landmark digital echosounder combined multi-frequency operation with improved data processing and integration tools, enabling much better estimates of fish population density and biomass.
Larger acoustic targets, such as the swim bladder of a large fish, produce strong backscatter at relatively low frequencies, whereas smaller organisms, such as krill and copepods, reflect sound only at much higher frequencies. Multi-frequency echo sounder measurements allow scientists to discriminate between acoustic targets of different sizes and target strengths and more accurately estimate the biomass of individual organisms as they scroll across the screen.
Next time, we will look at the echograms produced aboard Oscar Dyson and receive a crash course in interpretation from the Cave!
Personal Log
Work hard, play hard is an unofficial motto aboard Oscar Dyson. The officers, crew, and science team are keeping a fierce eye on the World Cup when off duty (Colombia’s goal call-back was a travesty!!).
The “Inaugural Collin McMillan Memorial Biannual Oscar Dyson Amateur Cribbage Tournament” is underway; stay tuned for updates and potential video coverage of the championship match!The future gyotaku model, Northern rock sole (Lepidopsetta polyxystra), posing for a picture before her big debut.Gyotaku is the traditional Japanese art of collecting fish prints. Engineer Victoria Southwick, ENS Josh Bennett, and Lt. Jesse Pierce captured the print of a Northern rock sole (Lepidopsetta polyxystra) brought up on haul 71, 06/28/26.
Wildlife sightings
A Short-tailed albatross (Phoebastria albatrus) follows us during trawling operations, hoping for a fishy treat. This threatened marine bird is a tale of cautious conservation success. Their population in the 1950s dwindled to as low as 25 individuals. Today, roughly 4,200 individuals are known to exist.
Fun Fact
In the Cave, it is not uncommon for the shallow layer to be filled with a mix of non-fish backscatter. Everyone has their pet theories as to what may be the source of these shallow acoustic targets (we know they aren’t fish), but they have all agreed to call it by one name… munge. Below is my artist’s interpretation of Munge as a heavy metal album.
MUNGE album cover
Sources
Balls, R. 1948. Herring fishing with the echometer. Journal du Conseil International pour l’Exploration de la Mer, 15: 193–206.
Korneliussen, R. J. (2018). Acoustic target classification.
Benoit-Bird, K. J., & Lawson, G. L. (2016). Ecological insights from pelagic habitats acquired using active acoustic techniques. Annual review of marine science, 8, 463-490.
Mordy, C. W., Bond, N. A., Cokelet, E. D., Deary, A., Lemagie, E., Proctor, P., … & Wisegarver, E. (2023). Progress of fisheries-oceanography coordinated investigations in the Gulf of Alaska and Aleutian Passes. Oceanography, 36(2/3), 94-100.
De Robertis, A., McKelvey, D. R., & Ressler, P. H. (2010). Development and application of an empirical multifrequency method for backscatter classification. Canadian Journal of Fisheries and Aquatic Sciences, 67(9), 1459-1474.
Simmonds, J., & MacLennan, D. N. (2008). Fisheries acoustics: theory and practice. John Wiley & Sons.
Holliday, D. V., & Pieper, R. E. (1995). Bioacoustical oceanography at high frequencies. ICES Journal of marine Science, 52(3-4), 279-296.
Current School: Williams Science and Fine Arts Magnet Elementary, Topeka Public Schools (USD 501)
Upcoming School: Jardine Middle School, Topeka Public Schools (USD 501)
Mission: SEAMAP Summer Groundfish Survey
Geographic Area of Cruise: Gulf of America/Gulf of Mexico
Date: June 28, 2026
Personal Log
At the USS Constitution in Boston with a group of History educators from Kansas.
From June 2026, headed from Kansas to Boston.
Taking a group of teachers to learn about Windfarms at Fort Hays, Kansas.
Hello, all, my name is Amelia Black and I am a proud Kansas public school teacher. I have been a teacher for over fifteen years with Topeka Public Schools (USD 501). Transitions, geography, incredible adventures, and connectivity is the theme for this summer.
One big transition for me will be happening this this coming school year as I move from teaching elementary ESOL ( English as a Second Language) to middle school. I will be transitioning to a new school and starting the next journey in my teaching career, teaching newcomers ELs (English Learners) at Jardine Middle School. Newcomers are students who are new to America, who often arrive speaking little or no English. I love working with my students, as well as other educators and helping them both to find their strengths, their voice, and empowering them through learning and inquisitiveness. My favorite part of being an educator are the moments when new understand or a new skill clicks and they have a ‘light bulb moment’. Seeing the understanding dawn is an amazing part of teaching.
Before I set up my new classroom, I am embarking on an incredible new adventure with NOAA (National Oceanic and Atmospheric Administration) as part of the Teacher at Sea (TAS) Program. I will leave Kansas on America’s 250th birthday (Independence Day) and I will be trading landlocked Kansas for open waters aboard the NOAA Ship Oregon II!
During this adventure, I will be learning from some amazing scientists and crew members as part of NOAA’s Summer Groundfish Survey. When I step onto the ship, I will be a “newcomer” myself. In addition to learning new vocabulary, scientific language, and marine culture, I will be getting my ‘sea legs’ as I learn how to navigate on a 170-foot fishing vessel. This will be a whole new adventure for me and as a life-long learner something I am truly excited to experience. I want my students to see that it is okay to try new things and step out of your comfort zone, that it is okay to be nervous when you learning something new and in a brand-new place. By stepping out of my comfort zone and working alongside NOAA scientists, I want to model resilience, curiosity, and bravery. Skills that I know my language learners experience as immigrants to America.
You might be wondering, what is an ESOL teacher doing going on scientific exploration? The answer is in connectivity. Connectivity between language, reading, science, and social studies. STEAM (Science, Technology, Engineering, Art, and Mathematics) AND Social Studies are essential for building background knowledge, academic vocabulary, and conceptual understanding. All components that are integral to comprehending complex texts and bring the joy of learning to the classroom.
As a passionate advocate for social studies, I serve on the board of the Kansas Geographic Alliance (KGA) and as a coordinator of their annual P4 Summer Institute (Plants, People, Places, Patterns). In this role I am given the opportunity to work alongside inspiring educators from across Kansas to explore and advocate for geography and social studies. Connectivity extends geographically: our rivers in Kansas lead to our oceans. The Midwestern watersheds affect our marine ecosystem in the Gulf. In participating in this experience, I will be able to bring back my learning and experiences not just to my students but to educators and others throughout Kansas.
To all my amazing students, families, and friends: I hope you are able to follow along this journey with me and I cannot wait to take you all on this learning experience. So get your maps out and follow along as we set off from Kansas to the Gulf of America/Mexico starting at Pascagoula, Mississippi.
Kansas Learning Log
Part of being a good educator is being prepared, so as I start this journey I want my log to reflect my learning but also the interconnectivity of science, social studies, and many other disciplines. The NOAA (National Oceanic and Atmospheric Administration) TAS (Teacher at Sea) Program has a blog format that I will be following in future blogs. The blog outline will start with Weather Data from the Bridge and a Scientific Log before my personal log. Each log will end with a fun learning opportunity or a sneak peak, you will have to read to find out! For this intro blog, I wanted to give you all a look at the Weather Data from Topeka, Kansas as well as a little information about this fantastic landlocked state.
Weather Data from Topeka, Kansas Latitude: 39.0483o N Longitude: -95.6780o W Elevation: 945 feet (288 meters) above sea level Wind Speed: 15mph (13 knots) Wind Direction: South (180o ) Visibility: 10 miles (8.69nm) Air Temperature: 93o F, heat index of 108o F Barometric Pressure: 29.64 Hg (1003.73) Sky: Mostly clear
A Little Bit about Kansas (Science and Technology Log)
You might already know a few things about Kansas. In addition to being a fly over state (thank you, Jason Aldean), Kansas is located in the middle of the United States. Kansas is the geographic center of the 48 contiguous United States (https://www.ngs.noaa.gov/PUBS_LIB/GeoCenter_USA1.pdf). In fact, prior to modern mapping technology advancements a ranch in Osborne County, Kansas was the official geodetic center of North America. This meant that all the maps created for the United States, Canada, and Mexico used this Kansas ranch as their reference point. https://www.penryfamily.com/geographicalcenters/meadesranch.html
Most people assume that Kansas is flat. However, the eastern part of Kansas is part of the Flint Hills and has some breathtakingly beautiful rolling hills and prairies. Additionally, the elevation of Kansas rises steadily from east to west. The lowest point of Kansas is 679 feet above sea level and the highest point is over 4,000 feet above sea level!
Out on boat 2904 with NOAA Ship Thomas Jefferson in the background
One of the highlights of this leg was getting the opportunity to spend a day aboard survey launch 2904. Junior Officer Julian Santos served as our coxswain, while Senior Survey Technician Ali DiTommaso managed the survey equipment. It was a great opportunity to experience how NOAA conducts nearshore hydrographic surveys and to see firsthand the challenges of collecting data in shallow water.
Our mission for the day was to locate the 15-meter depth contour on our assigned survey sheet. Using the multibeam sonar, the display was configured so that anything shallower than 15 meters appeared black. As we “painted” the seafloor with the multibeam, we watched for that black boundary. Once we reached the 15-meter contour, we stopped collecting multibeam data in that area and moved on to find the next section of the contour. Eventually, we connected these sections to create a continuous 15-meter line across the sheet.
Multibeam data from boat 2904
After establishing the contour, we switched to side-scan sonar to survey the area shallower than 15 meters. Because side-scan sonar can cover a much wider swath of the seafloor than the multibeam, our survey lines were spaced farther apart, allowing us to efficiently search for underwater features and potential hazards. During our survey we operated the 75-meter side-scan system in water depths ranging from approximately 7 to 15 meters. We did not have the opportunity to switch to the 50-meter side-scan configuration, which is typically used in even shallower water, from about 4 to 8 meters.
Getting side-scan data from boat 2904
Working from a small survey launch requires constant multitasking. Since it was the weekend, recreational boat traffic was heavy, requiring extra vigilance while navigating and collecting data. Unlike aboard the ship, the launch crew must solve many equipment issues on their own or troubleshoot with assistance over the phone. At one point, our air conditioning stopped working. Although it certainly made for a warm day, it did not affect the safety of the operation, so we continued surveying.
Ali DiTommaso manning the survey station on boat 2904
Although the surveying stops when the launch returns to the ship, the work is far from over. Every evening, the survey data is processed so it can be evaluated before the next day’s operations. During this process, the survey technicians apply the sound velocity information collected from the Sea-Bird CTD casts. Because sound travels at different speeds depending on the water’s temperature, salinity, and pressure, these measurements are essential for accurately calculating the depth of the seafloor.
The data is also corrected using the vessel’s position, motion, and orientation throughout the survey. Every pitch, roll, heave, and heading change of the launch is accounted for so the seafloor is mapped in its true position rather than being distorted by the boat’s movement. Water level corrections are also applied to account for changes in lake level during the survey.
Processed data for the sheet that Boat 2904 has been working on
Once these corrections have been made, the software combines the overlapping survey lines and “smooths” the edges between them to create a continuous, high-quality map of the seafloor. Processing also helps identify any holidays, small gaps where little or no data was collected. If holidays or other data quality issues are found, the area will need to be resurveyed before the sheet can be considered complete.
Total amount of processed data for this leg of NOAA Thomas Jefferson
Personal Log
Coxswain Junior Officer Julian Santos, Senior Survey Technician Ali DiTommaso, and myself aboard boat 2904
Going out on a survey launch was one of the highlights of my time aboard NOAA Ship Thomas Jefferson. I already love being out on the water, so I knew my biggest challenge wouldn’t be seasickness but trying not to be rocked to sleep! The water was calm, with waves less than a foot high, something the crew was very thankful for, even if I secretly wouldn’t have minded a little more excitement.
After boarding 2904, we were lowered over the side of the ship. I followed Senior Survey Technician Ali DiTommaso onto the bow, where she released the locking clamps that connected us to the davit. It was fascinating to watch how smoothly the process worked and to finally experience a launch from the small boat perspective.
Taking a turn at the wheel on boat 2904
We spent the day on the water from about 6:30 a.m. until 3:30 p.m. The launch may be much smaller than the ship, but it is surprisingly well equipped. We brought water, hot water for tea, breakfast, and snacks, and there was even a small refrigerator stocked with sandwich supplies and a microwave for lunch. It felt like a tiny floating office.
With Junior Officer Julian Santos serving as coxswain and Ali running the survey operations, I jokingly felt like the “passenger princess” for the day. While they handled the work, I had the opportunity to observe every aspect of the survey. Seeing hydrography on a smaller scale helped me better understand the process.
Boat 2904 coming in for recovery by NOAA Ship Thomas JeffersonBoat 2903 getting ready for recovery by NOAA Ship Thomas Jefferson
One of the most impressive moments came at the end of the day during recovery. Watching the coxswain carefully maneuver alongside the TJ looked effortless, but I quickly realized how much coordination is required. The engineers stand by in case there are any issues with the davit or the launch, the Bosun operates the davit, crew handle the lines, and the entire evolution is supervised by the Commanding Officer and Executive Officer. Meanwhile, the bridge monitors everything from the bridge wing to ensure the recovery is completed safely and efficiently.
Boat 2904 being recovered by the crew of NOAA Ship Thomas Jefferson
Before I had the chance to ride on one of the launches, I had watched them return to the ship from the deck. Seeing the boats racing across the water toward the TJ with spray flying behind them reminded me of something straight out of an old James Bond movie. They looked fast, powerful, and just a little dramatic. It felt like they were in slow motion!
Santos and Ali really made the day great, and I was lucky enough to get to tag along with them!
Did You Know?
The Great Lakes span 4,530 miles of coast and account for 21% of the world’s freshwater, with more that 30 million people relying on them for drinking water.
The nautical term “holiday” comes from the 17th century when missing a spot while painting a ship. “Were you on a holiday?” or “Do you need a holiday?”
