How to plot a GPS log on a map?

[Paul_UK]

Hi. Not sure if this is the best forum on this site to ask this but it's seems quite active here and thought i'm more likely to get answers.

I have just bought a Sony GPS-CS1 logger. Mainly for photography so I know where I took my photos. It can store 2 weeks worth of logs so I thought it would be handy to have on in the car on long journeys to see where I went.

I need to be able to view the logged NMEA file somehow. I downloaded "GPS Utility" which allows me to convert the NMEA into almost any other format. (limited size with unregistered version).

I have converted short journeys into .kml files for google earth but all the track points seem to be displaced to the left acording to the map.

Is there a better way to view a NMEA file on a map? I have Autoroute but cannot find anything that will convert to anything autoroute can read.

Thanks

Paul

[Tim Buxton]

What other formats will GPSUtilty save into? What format are your files in? Email me a small sample if you want.
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Tim

[philpugh]

A consistent displacement would point to a problem with the datums being used by the map and the logger. Check what map datum is being used and what datum is in use by your logger. I would expect (by default) that it would be set to WGS84.

You need to ensure that both the map datum and the GPS/logger datum are identical - otherwise you get the sorts of displacement you are seeing.

Have a look at www.oziexplorer.com for a nice bit of s/w for scanning and calibrating maps / images etc to most datums. There is a forum area for Oziexplorer on this site.

[mikealder]

Why not try GPSBable this will convert to and from most of the GPS related data formats that exist, and it doesn't have a limit with the file size, there is a version that runs in a dos style window or the GPSBabelGUI-2 which is more like a traditional windows based application - Mike

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