it appears much of the current manufactured units have a lifespan some times only a few years....we are still using 1970s brooks & gatehouse depth sounders ..work excellently...only in last year needed reader head serviced...done by b&g dealer 65 dollars...have two units both operating well...part of this they are sealed units which you open before each season & make sure they are not damp pink is damp blue is dry...if need to dry..heat in low temp oven until sensor is blue.....very low teck.....mentioned them to two different cruisers both have searched used marine stores & are very satisfied with results over last 7 to 10 years of cruising....unit operates on 4 AAA batteries for little more than year....many european yachts still using original b&g 1960 units successfully...costs used 100 to 150 for complete units..all wiring, brass thru hull fitting,.... with repeater readout in cockpit plus nav station unit readout. seems like good value to us...these units are b&g built in england...not after being... taken over....
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