Hi, we have an, a bit dated, Garmin Fishfinder
250 (B&W screen) with an Airmar P66 triducer.
, but we get no waterspeed.
The unit does ping, the paddle wheel
turns, but the waterspeed stays blank.
Any thoughts how to fix this.
We are on a budget
, so repairs
of any type are much preferable over buy new.
The manual provides no solution.
We have a working GPS
which provides speed over ground, but speed through the water
is nice to derive current