just to close the loop, i got another gt-15m inhull garmin transducer. i tried to reuse the older mounting ring, but it had been installed using silicone, not adhesive. when i filled it up with mineral oil, it separated from the hull/bilge. bummer!
new one seems to be working fine - my temp...
my garmin seems to be gradually declining?
temperature reads as -43, but no icebergs
bottom scan/depth profile only works at slow trolling speeds, i've tried several frequency settings
has anyone else had to diagnose this?
do i suspect the transducer and can i replace it?
thanks for any tips...