I have a Hunter 31 / 1986 with a SR MARINER sounder at the Helm. Does anybody know how to calibrate this thing? Or better does anybody out here have a manual? The hun31 draws 5'8" the transductor is sitting 18" below water line. While sailing in FL waters, I would like to have reliable data, and sailing in 6' waters the sounder is sometimes showing me 3'-4'. Turning it on in 12' waters it starts up with giving me 120' and it takes about 30min. to come close to the real depth. Thanks siggi
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