[gps-talkusers] Re: Earthmate to Map Calibration

There are any number of ways to get relative position.

Although the map data may be bad in one particular spot, we certainly have 
not found this problem elsewhere. Our map data is WGS84 and the Earthmate 
and BrailleNote are using WGS84.

Mike


At 10:52 AM 9/3/2004, you wrote:
>As someone else pointed out, there are more than one map coordinate
>systems in use, and this sounds to me like the "virtual position" mode
>you describe may not be using what has come to be the standard (which
>is, if I recall, WGS84).  While other GPS receivers are configurable so
>that you can change which coordinate system they report their results
>in, the EarthMate is not.
>
>I really think this sounds like a software bug to me that needs further
>investigation by Mike.
>
>While I don't own one of these, is there no other way in asking about
>the relative position of a POI without going into this virtual mode?
>
>Chip
>
>=20
>
> > -----Original Message-----
> > From: gps-talkusers-bounce@xxxxxxxxxxxxx=20
> > [mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Rich Irwin
> > Sent: Friday, August 27, 2004 11:02 PM
> > To: Gps-Talkusers
> > Subject: [gps-talkusers] Earthmate to Map Calibration
> >=20
> > I have now noticed a consistent difference, or should I say=20
> > offset, between the GPS position and the defined POI=20
> > position.  This has been observed in three different=20
> > locations as much as 200 miles apart in location.  Let me use=20
> > today's example to explain.
> > After dining at a restaurant, I was sitting outside waiting for a cab.
> > While sitting there I decided to investigate what was around=20
> > me.  With the Earthmate turned on and indicating that it was=20
> > picking up 7 satellites I pressed f and then enter to search=20
> > for the poi's nearest me.  In going down the list, I came=20
> > across the restaurant I was sitting in front of.  I set this=20
> > poi as my virtual position and checked the difference between=20
> > the GPS and virtual position.  The response was that the poi=20
> > was 981 feet southwest of the GPS position.  As I said=20
> > earlier, I have done this two other times in locations as far=20
> > away from where I was today by as much as 200 miles=20
> > (specifically Fresno, Emeryville, and Novato, CA.) always=20
> > with almost the exact same results.  Could the Earthmate be=20
> > out of calibration, or there be some sort of offset being=20
> > interpreted from the maps by the Braille note?  Is there any=20
> > way I can close this offset?
> > Rich Irwin
> > rich.irwin@xxxxxxxxxxx
> >=20
> >=20
> >=20
> >=20

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