NE SD | Gary, It can actually be done very cheap if you can figure this out. Import the GGA strings into excel and chart the data points. If you sort them by elevation.....say 3-5 meters difference, you can color the data points based on elevation and create a neat chart. Here's a project I did in excel if you want to check it out.
 (elevation chart.JPG)
Attachments
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 Humburgfieldtopodata.xls (121KB - 193 downloads)
elevation chart.JPG (39KB - 164 downloads)
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Elevation Mapping
