Mapping trials and tribulations

Submitted: Sunday, May 08, 2005 at 15:29

ThreadID: 22770 Views:2193 Replies:3 FollowUps:8

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Footloose

Well I finally got Oziexplorer to work, sort of. Exported from Natmap raster viewer import into Ozi and calibrate. Set up waypoints and track, giess what, my track is slightly off that shown on the map. Check calibration...OK. Check datums OK. Check coordinates, Ok. Hmm. Now I should of got a copy of Desert Tracks CD as I have the paper ones, but I didn't want to splurge for something I could set up myself....or so I thought. Map calibrated using Desert maps GPS points.
Geez there's a lot of fiddling to get this right. Time better spent on vehicle maintainance and loading etc before the trip.
Moral for a newbie is to have lots of time up your sleeve before getting this stuff set up.

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Reply By: Member - Jiarna (SA) - Sunday, May 08, 2005 at 15:37

Reply By: Mad Dog (Australia) - Sunday, May 08, 2005 at 15:45

Sunday, May 08, 2005 at 15:45

Gotta be something wrong there, the track should be spot on with a 250k map. Does the gps output datum match up with what oziexplorer expects file/configuration/gps

AnswerID: 110308

Follow Up By: Footloose - Sunday, May 08, 2005 at 15:52

Sunday, May 08, 2005 at 15:52

Ray, you're right, there is something wrong and its all my doing :)) Yes the datum of the gps and the map are the same.
I don't trust my import and calibration skills. I should of bought something Oziexplorer ready I guess. Can anyone tell me if the Desert Tracks CD maps require much fiddling with or just plug and play ?
TIA

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Follow Up By: Mad Dog (Australia) - Sunday, May 08, 2005 at 15:59

Sunday, May 08, 2005 at 15:59

The gps and map datum don't have to match. As long as Ozi knows what datum it is receiving from the gps it will do the necessary conversion. You could try going to the ozi web site and downloading the calibration files. With desert tracks all I did was copy over the image files, downloaded the calibration files and bob was me uncle.

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Follow Up By: Footloose - Sunday, May 08, 2005 at 16:05

Sunday, May 08, 2005 at 16:05

Ahhh...so even if I get a copy of desert tracks I still have to download the calibration files...more fiddling. I suppose its good for the soul :((

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Follow Up By: Mad Dog (Australia) - Sunday, May 08, 2005 at 16:17

Sunday, May 08, 2005 at 16:17

They may be on the disk I don't know but it's just as easy for me to download everything, I've got an uncapped cable connection, the web is just like another disk drive :)

So ozi knows the gps datum output ?

FollowupID: 366842

Follow Up By: Footloose - Sunday, May 08, 2005 at 16:23

Sunday, May 08, 2005 at 16:23

"the web is just like another disk drive " The only time I've heard that before is by a bloke with his own ISP.
Well the gps datum is set to be the same as everything else so I'm assuming that they all work together.

FollowupID: 366844

Follow Up By: The Explorer - Sunday, May 08, 2005 at 23:23

Sunday, May 08, 2005 at 23:23

Hello - keep in mind that some GPS units will output NMEA data (as used in OziExplorer by moving map.) strictly in WGS84 (e.g. all model Garmins) while with other makes (eg Magellan) some (not all apparently?) will output NMEA string in the same datum that is currently being used as display datum on GPS.....so if you have a Garmin, in OziExplorer set the FILE - CONFIGURATION - GPS - GPS NMEA Output Datum to WGS84. If you have a Magellan then have a play and see if changing the display datum on you unit changes the track position while using OziExplorer moving Map…if it does make a difference then match display datum to that in configutation of OziExplorer - (GPS NMEA Output Datum..as mentioned above)..if it makes no difference use WGS84.
Cheers
Greg

I sent one final shout after him to stick to the track, to which he replied “All right,” That was the last ever seen of Gibson - E Giles 23 April 1874

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