DeLorme 6 - Manual (Page 305)

Registering Images
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6. Change the WorkFile name in the WorkFile text box if you want to save your
previous point information.
7. Click Save.
Deleting an Existing WorkFile
To Delete an Existing WorkFile
Use the following steps to delete an existing WorkFile.
1. Click the ImageReg tab and then click WorkFile.
2. Select an existing WorkFile in the WorkFile directory and click Delete.
The workfile is deleted from the WorkFile directory.
3. Click Yes to confirm the deletion.
The WorkFile is deleted from the WorkFile directory.
Note The image to which it refers is not deleted.
Hints for Placing Points
Place control points in locations where it is easy to distinguish the same location on
both the image and the map. For example, you might find it helpful to place control
points at survey points, street intersections, or other point features.
It is also important to remember that the more corresponding control points you
place on your image and map, the better. A large number of control points should
only increase the accuracy of your resulting map.
Note Collinear points should be avoided. A small number of points in a line will not
produce a good solution. See example below.
To Place Control Points on an Image With Flat Terrain