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create a fresh Custom Map File. You can delete the old one, or just save
the new custom map over the old one.
GPS Data File
This file format contains all the GPS navigation information (waypoints,
event marker icons, routes and trails) used by your GPS unit and
MapCreate. The file extension is *.usr (for User file) and the file is saved
either to your hard drive or directly to your MMC or SDC. As with other
Windows-based files, you can drag and drop these files from the hard
drive onto an MMC or SDC, which is then loaded into your GPS unit.
You can open and make changes in a GPS Data File once it has been
created. The contents can include any combination of waypoints, routes,
trails and event marker icons. The information shows up graphically on
the Master Map as symbols with names. The same information is also
available as text in a list window, such as the Waypoint List window.
Your GPS unit saves field-collected GPS information in the same format
so MapCreate can be used to save valuable travel or adventure data for a
later trip. This also makes it easy to exchange GPS data with friends
using Lowrance or Eagle GPS equipment.
ASCII Text File
This is a universal text file format compatible with word processors and
other software programs. MapCreate can exchange routes and
waypoint lists with other mapping programs by importing and
exporting GPS information as comma-delimited ASCII text files. ASCII
(pronounced "ask-ee") uses the *.txt file extension. You don't need to
work with these files, unless you plan to exchange routes and
waypoints between MapCreate and other mapping programs. For more
information on how to use this file type, see the online Command
Reference topics "Export GPS Data" and "Import GPS Data."
GPS Data Manger (GDM) File
This is an older file format used by MapCreate 5 and MapCreate 4 to
hold navigation data (waypoints and such). MapCreate 6 can open
these files, making the program backward compatible with versions 5
and 4. The GDM file extension is *.low. Although MapCreate 6 is
designed to load and read older GPS Data Files in the *.low format,
MapCreate 6.0 also allowed users to choose to save new files in the
older format (though the program could not actually save them). This
has been corrected in version 6.2. You can still open files in either
format, but you can now only save GPS Data Files in the newer *.usr
format. Please note that your MapCreate 6-compatible GPS unit can
only read *.usr files.