DeLorme Street Atlas USA software allows you to manipulate data through a layering process. The Map File binds together the different layers that you create. Below is a detailed description of the different file types you will encounter.
What is a Map File?
A Map File consists of the map center coordinates, the current zoom level, the current magnification, preferences, and any routes or draw layers you have added to it. As you create routes and draw layers, they are added to the currently selected Map File. Map Files are saved by default in C:\DeLorme Docs\Map Files. It will have a file extension of .saf. Each associated file is saved in its respective folder in the C:\DeLorme Docs directory. For example, a draw layer is saved in C:\DeLorme Docs\Draw. What is a Draw File?
Imagine a draw file as a sheet of glass laying on top of your map. You can add various objects to the draw file to help enhance or pinpoint specific areas on the map, but these objects do not become part of the map. They exist in a draw file which overlays the map. You can create more than one draw file and overlay one on top of the other while still viewing the map beneath. When a draw file is cleared or deleted, the objects in the draw file do not display or they are deleted along with the draw file. When draw files are created and saved, they are saved within the current Map File. Draw layers have a .an1 extension.
- Draw Layer ?Created when a line, arc, spline, circle, rectangle, polygon, symbol, MapNote, or text label is added to the map.
Road Layer ?Created when a routable road is added to the map. These become part of the searchable database. 
Waypoint Layer ?Created when a waypoint is added to the map. These become part of the searchable database.
Track Layer?Created when a track layer is added to the map. These become part of the searchable database.
What is a DDS File?
A .dds file is created when you import data using the Xdata tab. Note: A .dds file is a proprietary DeLorme file format.
What is a GPL Log File?
A GPL log file records your route as you travel. This allows you to play the file back at a later date. The file will have a .gpl extension. Note: A GPL log file is a proprietary DeLorme File format.
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