Fathometer

Fathometer - A brand name for a depth measuring device.
FCC Rules - Federal Communications Commission Rules governing radio equipment and operation in the United States.

fathometer - (Raytheon) trademark for a brand of an electronic depth finder.
fay, to - To join pieces of timber together very closely Plank is said to fay the timbers when it fits closely to it.

Fathometer:
A depth measuring device.
FCC Rules:
Federal Communications Commission Rules governing radio equipment and operation in the United States.

Depth Meter or Fathometer - Instrument used to determine soundings or depth of water ...

depthsounder, echo sounder, sounder, Fathometer, depthfinder
An electronic device that indicates the depth of water. A recording depthsounder produces a record of depth readings over time.
desalinator ...

This technique has been superseded by sonic depth finders for measuring mechanically the depth of water beneath a ship, one version of which is the Fathometer (trademark).[11] The record made by such a device is a fathogram.

See also: Light, Forward, Forestaysail, Forestay, Feet