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The 6 pin DIN plug found on the GPSMAP 421s data/power cable (Garmin part number 010-10918-00) is used for the sonar input.
Data transfer from the GPSMAP 421s is easily transferred by memory card. Information about data transfer on the 421s is at about 50 seconds into this video. http://www.youtube.com/gpscity#p/search/6/8ddIgvCAUmI
Real time NMEA data can be transferred using Garmin part number 010-10918-00 wired to a DB-9 serial connector (Instructions are on the cable).
It then can be adapted to USB using a serial to USB adapter. http://www.gpscity.com/gilsson-serial-to-usb-port-4in-adapter-for-pc-and-mac.html
This happens to about 1% of the units I've sold. Sometimes the GPS antenna software reverts to version 0.00 which of course is nothing. Check in the GPS by going: Menu > Menu > Setup > System > Menu to see the versions installed.
Use Garmin WebUpdater (free from Garmin web site) to reload the software and update if necessary - they bring out updates a few times a year - it's all free and very easy to do using WebUpdater.
Check the pins at the connector on the back of your unit. Make sure one of them is not bent or broken off. One of the pins on mine is missing about 1/16" of the tip. My boat repair shop says it's the power lead, but Garmin wants $200 for a generic repair.
guys: book says:
PIN 1 (red) 10-40 volts DC
PIN 2 (black) Ground
PIN 3 (blue) NMEA out Shows this goes to Autopilot/NMEA devise and to RXD positive RXD negative goes to ground (black)
PIN 4 (brown) NMEA in Goes to GBR 21 Beacon Receiver to a blue wire, brown wire on thaat devise goes to PIN 3 and the negative goes to ground
PIN 5 (white) no connection
PIN 6 (Green) no connection
PIN 7 (yellow) goes to alarm low Shows going to negative terminal on alarm relay and positive terminal goes to PIN 1 (red)