Plotter position error

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Ardenfour

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I have a Navman plotter which worked fine till a month or so ago. Not having the required active antenna, it gets it's position via nmea connection from a Garmin 128. All good. Now, however, the plotter's position has a lat error of around 30'. The Garmin position is correct. The time on both instruments is correct.
Any suggestions please, about what could be the cause? Thanks
 
Ardenfour said:
I have a Navman plotter which worked fine till a month or so ago. Not having the required active antenna, it gets it's position via nmea connection from a Garmin 128. All good. Now, however, the plotter's position has a lat error of around 30'. The Garmin position is correct. The time on both instruments is correct.
Any suggestions please, about what could be the cause? Thanks
Click to expand...

Have you installed the latest update for the Garmin ? If not, you should.

Is the date on the both instruments correct ?
 
Last edited:
PaulRainbow said:
Have you installed the latest update for the Garmin ? If not, you should.
Click to expand...

Latest 128 software Version 2.10 issued 16 years ago. I suspect the OP might just have noticed a problem before now.
There is sometimes a discrepancy between my Garmin 128 and the numbers appearing on my ST50 repeater but only in seconds - not enough to worry me. A 30nm error is a tad annoying, I imagine. Borrow another G128 (or similar NMEA 0183 device - I have a spare @ JWD just now) to check which is wrong.
 
awol said:
Latest 128 software Version 2.10 issued 16 years ago. I suspect the OP might just have noticed a problem before now.
Click to expand...

Another unnecessary sarcastic reply.

There have been a lot of GPS issues over the past few weeks where electronics that have been working perfectly OK for many years suddenly have problems, so it doesn't follow the problems would have been noticed before. I don't know of every software update version for every single instrument in the World and i'm not going to check, so it's worth suggesting that the owner of such equipment check for updates himself.
 
Ardenfour said:
I have a Navman plotter which worked fine till a month or so ago. Not having the required active antenna, it gets it's position via nmea connection from a Garmin 128. All good. Now, however, the plotter's position has a lat error of around 30'. The Garmin position is correct. The time on both instruments is correct.
Any suggestions please, about what could be the cause? Thanks
Click to expand...

It's some time since I had a Navman plotter, but I seem to recall that it had a "map shift" facility so that you could move the chart to match your actual position. This might help if you can't sort it out otherwise.
 
Thanks for all the responses. Until it went wonky, the plotter just mimicked the co-ordinates from the Garmin. I dong think it was using it as an antenna.
Time is correct on both.
 
awol said:
Thanks Paul for taking the effort to check that.
Click to expand...

You are absolutely right to thank Paul for going the extra mile as all he really needs to do is suggest that a software update might help. It's then up to the OP to investigate whether a software update might be available. Any implied criticism towards Paul for doing anything less would be totally unacceptable on this forum. :encouragement:

Errrrrr .... hang on a mo.

Richard
 
I'm not sure how feasible this is for you, but you could connect a laptop up to the serial data from the Garmin and check if the captured data tallies with the displayed data. That way you would be able to narrow it down to either the GPS or the Plotter.

Regards,
Stephen
 
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