dsc radio connection to gps

[junyer]

can some one confuse me a bit more? i got a new dsc radio and an old eagle gps do i connect them? can i connect them? the gps only has 1 wire which aparently sends nmea data (nmea0180 and nmea 0183) the radio needs an $gprmc nmea data sentance. what the hell are they talking about?

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[snowleopard]

yes, connect them.

the dsc can only send out your distress position if it has the information.

nmea needs + & - connections. if it only has one, it will be +. the - side will be carried by the - (earth) of the power supply.

best check with manufacturer if you can.

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[wooslehunter]

$GPRMC sentence is the type of data the GPS send out. It's a standard sentence that most GPS units send out and contains the following:

Time (UTC)
Status - valid or not
Latitude at the time.
Longitude at the time.
Speed over ground in knots.
Course over the ground.
Date (DDMMYY).
Variation, degrees.
Variation sense, E or W.
Checksum - this is something that can be calculated from the data. If the calculated checksum is the same as the one sent then there are probably no errors.

You may find that the GPS has several options for its output data. You need to make sure that one of them contains the RMC sentence if that's what your radio wants.

It's not really that complex to connect the GPS to the radio. If there's one output wire from the GPS then connect that to the data input on the radio - assuming you know it to be the data output. As above, ground should be via the ground wires. You may have to set the radio to accept position from the NMEA rather than by manual entry. You may also have to switch on the NMEA output on the GPS. The manuals from both should explain how. If you see anything about "Baud Rate" set both GPS and radio to the same - generally NMEA is set to 4800 by default.

One last point. It's generally a good idea to try things out at home and power with a 12v battery. However, if the GPS is not locked then the data may not be sent out.

Good luck.

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[squidge]

Right ! ok! got it!,
the garmin is connected to the dsc.
The wireing is as the manuals said,
the gps is powered up,displays data,
it is set to NMEA0183 v 2.0 GPGGA,
the DCS is on and.........................




NOTHING ! not a sausage ! Bloody thing! bring back so***ng morse Im off to the pub!/forums/images/icons/wink.gif

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[snowleopard]

tetchy little s**s aren\'t they!

in my case the the (icom) dsc only got the message as long as the garmin was set to nmea 0183 v2.0

when i set it to v1.5 the icom ignored it.

unfortunately the raytheon kit was totally confused by v2.0!!!

incidentally the garmin defaults to its own code which nothing else understands at all.

and of course each manufacturer says the other has misinterpreted the standard.

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[junyer]

thanks every body. i knew id be confused ill just try it and see what happens

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[wooslehunter]

Most GPS units will send out several sentences.

Check with the GPS manual but you may find the V2.0 does not contain the RMC sentence. In the manual for my old and now dead Magellan 3000XL it stated that NMEA0183B V1.5 was the only version that contained the RMC sentence.

If there are other options, try one of those.

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