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GPS Problems?

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FourWinds F
FourWinds Feb 17, 2008 19:28:01
Replying to gjrk

gjrk wrote:
Thanks very much for your prompt replies 4W and Tiompan. I suppose it must be the heavily drilled respect for authority in me, but I found it difficult to believe that the Inventory could be wrong!
To check the GPS readings I'd have to compare them with someone else's and I just had a quick glance at your website 4W. I'd rechecked Drombeg yesterday (It's a handy place for my small boy to play around, except for that mound of rusty offerings in the centre) and my circle reading corresponds with your Fulacht Fiadh?
Sorry for getting so bloody obsessive about a few metres but I'm trying to sort something out.
g
There could be a couple of factors here. I used to take a reading as soon as I reached a site. In most instances the GPS thinks you're still moving and so can add a few metres. Then, if my reading was 10m out due to the inaccuracy of the GPS and your reading is 10m out then that could give a difference of 20m between readings. Now I always put my GPS down while I'm taking photos and then take a reading as I leave. I hope this gives a more stable and accurate reading.

T tiompan
tiompan Feb 17, 2008 19:52:58
Replying to FourWinds

[/quote]

There could be a couple of factors here. I used to take a reading as soon as I reached a site. In most instances the GPS thinks you're still moving and so can add a few metres. Then, if my reading was 10m out due to the inaccuracy of the GPS and your reading is 10m out then that could give a difference of 20m between readings. Now I always put my GPS down while I'm taking photos and then take a reading as I leave. I hope this gives a more stable and accurate reading.[/quote]

Until we become WAAS enabled we will just have to put up with the inaccuracies , sometimes we will be lucky though. I usually find that returning to a gps reference witth the same device is rarely out that much but there is plenty of potential for inaccuracies .

G gjrk
gjrk Feb 17, 2008 23:49:31
Replying to FourWinds

Thanks 4W. I'll try to let it sit for a while like you suggest, but I think I'll also head up and check the unit against Tiompan's pillar. It should be interesting to look down at everything from the other side of the lens for a change.
g