" Thanks everyone, you guys are great
I will have to wait a little longer to find out who makes the depth
finder that is built into the dash. The boat is still shrinkwrapped
and as much as I hate to admit it, winter is far from over in Boston.
When I can get back into the boat, I will check the sensitivity of the
in-dash. Also I suspect that the Garmin needs the transducer to be
adjusted, Maybe there are even barnicles on it. I will check that out.
The reason that I have 2 depth finders is that the boat had one (
which did not work well) and I brought the Garmin GPS/Depth finder
over from a previous boat. ( needed a GPS)
I also read on the Garmin site that 2 depth finders could interfere
with each other dependeing on the frequency of the 2. (As a guy who
makes a living working with wireless microphones for musicals, I am
all too aware of conflicting frequency issues)
Again, I will have to wait a little while before I remove the shrink
wrap to find out what the in dash one is, and then figure out what
it's frequency is.
thanks again
please send more if you think of anything

PS Boy it is great to be thinking of boat problems again!