WordNet
n. navigational instrument used to measure the depth of a body of water (as by ultrasound or radar)
Wikipedia
A depth finder may refer to any of the following:
- Sonar: use of underwater sound propagation to measure depth
- Fathometer or fishfinder: a device to locate fish at various water depths
- Echo sounding: a technique using sound pulses to measure depth
- sounding line: a length of rope used to measure water depth
Usage examples of "depth finder".
His eyes lighted up with approval at the sonar depth finder, the radar with its ten-inch cathode-ray tube, the direction finder with its loop antenna and five-channel radio receiver.
His depth finder said the bottom was holding steady at ninety meters.
I pulled it back until we barely had seaway, and turned on the little whirling red bulb of the depth finder.
Pity we don't have a leadsman up in the bows singing out the river depth, instead of a sonar depth finder.
A bomb aboard a little pleasure boat couldn't reasonably be hooked up to the depth finder.
The depth finder was reading eleven feet, and I had to move easterly about fifty feet to get the distant markers lined up.
On the console above the wheel is a sprout of loose wires where the bad guys removed some of the Contender's electronics-probably the VHF, depth finder and Loran.