This will only be of interest to those of you, who like me, are
picky, picky, picky about sonar - but I thought it really good reading.
Check out
http://home.comcast.net/~cwebb56/TM_Intf.html
Of particular interest to me was the test info on built-in transducers,
ala MinnKota. I got interested in this when I noticed that if I slowly
motored across a flat with the outboard, it might show no fish -
but if I stopped and fished anyway, the screen would show fish after
I cut the main engine - I am running off the main cranking battery for
a power source, and believe I am experiencing alternator noise causing
my auto sensitivity to ratchet down - when I kill the motor, it increases
the sensitivity and reduces the filter effect - I think Lowrance/Eagle
calls it ASP. Jeff