20 Most Recent Humminbird Fishing System, 787c2 Combo Without Gps 4066801 Plus - Page 2 Questions & Answers


Hi Ken
A little wiring 101 is in order here I think.
NMEA out (+ and -) from your GPS goes to NMEA in (+ and -) of your VHF.

Hope this helps you out

Humminbird... | Answered on Mar 14, 2016


Normally a new clean faced 1 KW thru-hull transducer works to 3,000 feet ( 914 meters).
Maybe the impedance of the transducer and electronics driving it do not match.
Connecting cable too long?
Poor connections. Look at plug pins to see if any are bent.

Humminbird... | Answered on Mar 16, 2015


Be sure you have your unit set in "max mode" and run it on 200khz frequency see if this makes any difference. Also be sure your unit is wired directly to your battery not through a switch or fuse panel as this can rob your unit of voltage, impacting the strength of your sonar signal.

Humminbird... | Answered on Oct 14, 2014


You need to set the transducer lower. When at speed, the hull of the ship raises up out of the water and hence your transducer is probably not deep enough at these times to give a proper reading.

Humminbird... | Answered on Sep 05, 2014

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