by george Economopoulos
(Athens, greece)
I have a hsb2 plus Raymarine system (f Finder, radar, aotopilot etc) recently the L760 fish finder didnot displyed bottom or fish ... just dotts . i have a 744V triducer (600w) and i suspct that it is dead . should i change it to a similar model or go for a compatible in hull (depth only) one?