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)
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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
It sounds like it has lost its memory battery. Usually you
would get a "memory battery low" message as it is on its
way out but you don't mention that so perhaps it has
The battery is rechargeable - if you leave it switched off
and loaded with a fresh set of alkalines for a few days it
may recover. If not contact Garmin as they have replaced
many memory batteries free of charge even out of warranty.
I have 2 data cards for Garmin gpsmap 180 and working well.I got this offshore boat from Tallahasse 3 wks ago that has a built in Garmin gps 180 with 2 data cards on it and I have no use for it because I have the boat in Texas now. Don't know if this is the right one that you need, all I know is that these 2 cards are programed for Florida gulf.I can ask the previous owner of the boat about the details of these 2 cards. I'm willing to trade it for a data card for the lower gulf preferably from Brownsville, Tx. to Louisiana or anything that will cover Port Isabel, Port Mansfield, Port Aransas. You can e-mail me at firstname.lastname@example.org or call me at (956) 240-8420 .My name is Oliver.
Could be worth a look at the connector on the back of the unit itself. As I discovered a few weeks back, they aren't as saltwater resistant as the IP67 rating would lead you to expect.
Compare the pins in the plug with the diagram on page 99 of your manual (also downloadable from http://www8.garmin.com/manuals/GPSMAP198CSounder_OwnersManual.pdf) and make sure all the pins that are supposed to be there actually are. In particular, make sure pin 15 is in a decent state. This one carries power to the unit, but will act as a sacrificial anode in the presence of saltwater, and can rapidly corrode to oblivion.
If this is what has happened, you have a bit of a problem, because Garmin, don't appear to be very good at making spares available.
I was lucky in that the GPS I was fixing was a lower end model that only used five of the seven pins in its connector, so I was able to rewire to provide a supply through the unused pins. The diagram suggests that the 198C also sports a few unused pins, so you may well be in luck.