Underwater vehicles

On a farm pen, an ROV records net panels, tears, and mooring lines—not deep-ocean ratings or treatment work.

Observation vs tool: what an underwater robot is once thrusters, buoyancy, and a tether put a person still in the loop.

Housing depth is survival. Identification distance is water clarity. Learn when to add light, move closer, or switch to sonar—without trusting pool clips.

Headline ROV runtime is a best case. Lights, sonar, and current shrink it; dim loads and recover by voltage, not the clock.

Depth is only straight down. Plan tether for drift, current, and slack—or move the boat. Marina drops differ from dam faces and net pens.

Same ROV, different job: dam face, gate, and intake change depth, current, tether, and whether depth hold is enough.

A fish finder marks a sonar return. A drop camera or fishing ROV shows fish, weed, or gear only if battery, tether, and drift let it arrive.

A hull ROV pass must show coating, anodes, intakes, a relocatable mark, steady distance, time, and position—not a drifting glance.

When cameras fail in dark or dirty water, imaging sonar finds returns; cameras identify them. Depth ping is not an inspection image.

Murky water limits cameras to short optical reach. Pool clips and display zoom are not harbor proof—check FOV, lumens, and real clarity.