Co-ordinate problem with two GPS's

croesus · Occasional Visitor Joined: Apr 13, 2009 Posts: 3

I have an Active 10 and a Garmin Etrex H - They seem to give different co-ordinate values for the same place. I think I have set them up accurately - datum etc. e.g.

Active 10: N55 24.544, W1 41.310
Garmin: N55 24.540, W1 41.210

The variation is more pronounced in the W value in all cases. Any ideas? I need to use them together for setting up geocaches (A10) with someone else finding them using the Garmin.

I assume there must be some setup I have missed.

collegelecturer · Occasional Visitor Joined: Aug 05, 2007 Posts: 5

You can sometimes get electrical interference between two GPS placed side by side with both switched on and this may produce different readings. Use one at time. This may not solve it but is worth trying.

croesus · Occasional Visitor Joined: Apr 13, 2009 Posts: 3

Thanks for the suggestion.

Tried it GPS's away from each other and off while one gets reading. Still reads W 0.1 of a minute away consistently - I'm not sure how far this is, but it is significant when navigating a cache!

mikealder · Posted: Mon Apr 13, 2009 12:57 pm Post subject:

Check both devices are using the same datum, quite often this sort of error in reported position can be down to units using different settings - Mike

croesus · Occasional Visitor Joined: Apr 13, 2009 Posts: 3

Solved!

It is all about Datum - There does not seem a way to change the Active 10 - I assumed (wrongly) that this would be OSGB.

I set the Garmin and the EasyGPS settings not to OSGB, but to WGS 84 - now they both come up with same co-ordinates.

Thanks to those that replied

FrequentFlyer · Posted: Mon Apr 13, 2009 4:15 pm Post subject:

What does that sort of error actually mean ? 1Metre out....2, 4, 10 ? Another good reason to carry a map as apposed to tumbling over the edge of a cliff !

philpugh · Posted: Tue Apr 21, 2009 5:33 pm Post subject:

M8TJT · Posted: Tue Apr 21, 2009 8:09 pm Post subject:

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