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GPS help please
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Posted by Andy68 (My Page) on Tue, Nov 15, 05 at 5:27
| I'm playing around with a GPS system on my Palm, with which you import maps.
I'm importing from Autoroute 2006
If I put in a value of (say) 53 degrees 26' 52" N and 2 degrees 45' 35" W
Then the software I'm using CHANGES that to;
53 degrees 26 40.6 N 2 degrees 45 19.9 W
As I have no idea how GPS or co-ordinates work - I was hoping someone might know what it's doing and how I can get around it?
Thanks! |
Follow-Up Postings:
RE: GPS help please
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| Andy - I asked a couple of friends who play around with those GPS outfits about your problem and they were both stumped! One did ask me that if you did find a solution to please post it so he would know, too! Of course, I would'nt even know how to turn one of those things on! Dale |
RE: GPS help please
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| Make certain your WAAS is on and the datum you are using is the correct one. And dont be afraid to go to www.geocaching.com to ask them at the forums |
RE: GPS help please
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| Your GPS is probably storing it's latitude/longitude in a different format. Your input appears to be in sessagessimal format (I probably spelled it wrong) but it is typically shortened to DMS (as in Degree Minutes Seconds) and your GPS may be set to DD (as in deciman degrees) so it would internally convert it from DMS to DD and display it in DD, even though it is the SAME waypoint. The biggest thing is to make sure your lat/long is in the same map datum as your GPS... Most USGS quads are in eith NAD27 (North American Datum 1927) but there may be newer ones like WGS-82, etc. This is horizontal datum if you're GPS specifies which and if you have muliple NAD27 datum, select (NAD 27 CONUS). If you enter a NAD27 lat/long into a GPS set to say WGS-82, your waypoint will be off. Not much in the case of WGS-82 vrs NAD27 but in some obscure datum, you could be off a lot! Jay |
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