Originally Posted by unbusted67
So, I've got the Raymarine to accept xte, btw, and dtw sentences but it won't display sog, utc even though the Garmin lists vtg as an output sentence.
I also can't get my icom
m304 to display position data. The 304 manual says it will only receive gps 2.0. Is this the same thing as 0183? There is also a "nmea high speed" setting in the Garmin. Maybe this is the same thing as 2.0?
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First of all the NMEA high speed is mostly used for AIS
data and it is at a baud rate of 38400. The Icom M304 is at the standard speed 4800 baud rate, so that is not your problem. The GPS 2.0 they are talking about is NMEA 0183
version 2.0 (4800).
Some radios do not like sharing the same output leg with other devices. In my experience this is especially true with a Garmin GPS. There are two outputs for NMEA 0183 on the Garmin 440, personally I would use one NMEA output for the radio
and one for the autopilot
. Also make sure that both outputs are set up for NMEA Standard on the 440.
Another thing to check out. You have to connect the NMEA out (+) from the Garmin to the NMEA in (+) on the radio
, match the negative legs too. The Garmin uses the negative ground cable as the NMEA (-) leg for all in and out ports
. The positive legs all have individual wires.
Here is link to the Garmin wiring
diagram for that unit.
If it still does not work try switching polarity of the wires at the radio connection.
You might want to check that you have the latest software
package for the 440 also:
Garmin: GPSMAP 440/440S Change History