Bathymetric Navigation FOM 9 Long Sleeve Tee

Before there was GPS, radar, or satellite coverage—there was depth. Bathymetric navigation is the discipline of reading the ocean’s hidden terrain: seamounts, slopes, trenches, and plateaus. Sailors once relied on the subtle rise and fall of the seafloor to chart their course, using soundings and sonar to match underwater features to paper charts. It demanded more than knowledge—it demanded intuition, precision, and respect for a world most will never see.

This shirt isn’t just apparel—it’s a nod to the navigators who mastered the art of bottom contour navigation when tech failed or never existed. It honors the mariners who could look at a depth profile and say, “We’re here,” without a single signal in the sky.

Worn by those who still value analog skill in a digital world, it’s for the sailor who believes that the ocean speaks a language—etched in depth lines and echoed in sound—and real seafarers know how to listen.

Our classic unisex long sleeve tee fits like a well-loved favorite. Casually elegant with an excellent quality print, it is an irreplaceable everyday item for anyone. 

.: 100% Airlume combed and ring-spun cotton (fiber content varies for different colors)
.: Light fabric (4.2 oz/yd² (142 g/m²))
.: Retail fit
.: Runs true to size
.: Tear away label

EU representative: HONSON VENTURES LIMITED, gpsr@honsonventures.com, 3, Gnaftis House flat 102, Limassol, Mesa Geitonia, 4003, CY

Product information: Bella+Canvas 3501, 2 year warranty in EU and Northern Ireland as per Directive 1999/44/EC

Warnings, Hazard: For adults, Made in Nicaragua

Care instructions: Machine wash: warm (max 40C or 105F), Non-chlorine: bleach as needed, Tumble dry: low heat, Iron, team or dry: medium heat, Do not dryclean