When you open a shapefile, GPS Trackmaker will ask you which of the shapefile data fields (attributes) you want to use to label the shape this label that will be used to identify the uploaded feature in the GPS. While the program has some support for grid coordinates systems like Transverse Mercator, it’s easier to work with the data if it’s already in the WGS84 geographic coordinate system (lat./long.), the standard for most GPS units. GPS Trackmaker – This program has the ability to open point, line and area shapefiles, and upload the data to a GPS. But that’s not a problem here, because both of the programs I’ll talk about convert area shapefiles into a line that describes the perimeter of the area, which can be exported to a GPS unit. But there are only two standard kinds of position data that can be imported by a GPS, points (waypoints) and lines (tracks and routes) areas aren’t a supported data type.
There are three kinds of shapefiles: point, line, and area/polygon.
Two of the programs I’ve posted about earlier have the capability to import GIS data in shapefile format into a GPS unit. Or you might have a point shapefile with the positions of sampling spots it would be convenient to be able to import those sampling spot positions into a GPS as waypoints, and then use the waypoint positions to navigate to them. For example, you might have an area shapefile demarcating survey areas, and it could be helpful to import the boundaries of that area into your GPS unit, so that you’ll know when you’re inside (or outside) the survey area. But there may be times when you might want to do the opposite – take GIS data and export it to a GPS. GPS units are often used to gather data for export to, and use in, GIS.
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