Fishfinder works for me
One thing I always found funny is sail boats have these really expensive basic depthfinders. When it came time to install a depth instrument in my 26, I went with a Garmin GPSMAP 125 combination GPS/Depth finder/Fish finder.For the cost of the average typical sailboat depth instrument, I get GPS position, waypoints, NMEA output for my tiller pilot, depth, bottom contour and type(soft/hard), Man Overboard Position, Anchor and depth alarm and if I choose to fish, I know where they are. If I upgraded to the next pricier model, I would have had a chart plotter too!My depth transducer shoots through the hull and I mounted the GPS antenna on the stern rail seats. The display is on a goldeye quick release mount. One base is mounted under the companionway steps, the other on the bulkhead in the cockpit. I have used this arrangement since 1999, and I have been very pleased.