Hi, we have an, a bit dated,
Garmin Fishfinder 250 (B&W screen) with an Airmar P66 triducer.
Depth and
water temperature
work, 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 speeds.



