Preliminary Testers Wanted - GPS Tracker

**ukchris** · 11-10-2004, 03:52 PM

I don't really know yet. The GPS mechanism I am using gives me co-ordinates of, for example I am in Massachusetts. As I wrote the LAT/LON out I would get, for example:

lat="42.80236" lon="71.1222266666667"

When I map this I am way off, if I map with:

lat="42.80236" lon="-71.1222266666667"

It is spot on. The GPS returns the coordinate as a REAL, I just need to sort out what is happening and when and if I need to alter it. Not sure f the guy in Cali used my program or not, if he did then it worked without the "-".

Chris.

**adamschneider** · 11-10-2004, 04:05 PM

Originally Posted by ukchris

Not sure f the guy in Cali used my program or not, if he did then it worked without the "-".

The California GPX file contained the negative signs. Otherwise, he would have gotten a mirror-image map of somewhere in eastern China!

GPS Visualizer doesn't try to "guess" whether or not a GPX file contains the wrong signs on the coordinates; it assumes the file was correct to begin with.

**ukchris** · 11-10-2004, 04:07 PM

In that case he didn't create it with my first test version, or he'd be in China, or he manually fixed it like I did!

**BigToach** · 11-10-2004, 05:09 PM

no i did create it with your app. i made a couple of maps and realized that i was getting maps that were flipped and that the backgrounds weren't being fixed right, so i just changed em all to negatives.
i forgot to mention that it wasnt getting the negatives in there right.
btw, sexy programs from both of you guys!!.

**heliodoro** · 11-11-2004, 10:17 AM

He
i,some data
Regards
heliodoro

**ukchris** · 11-11-2004, 10:24 AM

Thanks heliodoro, can you tell me where you are from? Or where, generally, the track was made?

**heliodoro** · 11-11-2004, 10:33 AM

The track was make this morning in north Stockholm,Sweden.

I´m on MSN helio108@hotmail.com is you want to ask same thing.
heliodoro

**ukchris** · 11-11-2004, 10:49 AM

How does this look? This confirms I can't just add a "-" to fix it for the US

As you are the other side of the Greenwich Meridian I manuall reset the Longitude back to positive (an issue caused by my program). This map is from www.gpsvisualizer.com

Chris.

**ukchris** · 11-11-2004, 10:58 AM

Adam, does GPSVisualizer use <speed></speed> ? Apparently this has been dropped as a part of the GPX specification, they say many apps will still accept it, personally I think it is valuable, but I guess their intention is to calculate speed from the points/time instead - a lot of extra work that shouldn't really be needed.

**ukchris** · 11-11-2004, 01:02 PM

A track loaded into MapPoint. It just displays as a line which is kind of dull. It could generate a route between points but it would get very messy with hundreds of points logged by the GPS. Might be workable to create a route point every start / stop and you could then look at how you got between them compare to what MapPoint would recommend.