Error Loading Polygon or Error Loading GeoPin when TNP starts.

When a data file becomes corrupted, Terrain Navigator Pro does its best to recover from the error. However, in some cases (usually with files that are not in-use) TNP fails to recover the file. This can cause repeated error messages of "error loading polygon data", "error loading geopins" or similar messages when TNP starts.

This can be corrected by deleting the corrupted files so that TNP can rebuild them.

After exiting Terrain Navigator Pro, open the following folder on the PC:
C:\Users\<your username>\AppData\Local\Maptech\Terrain Navigator Pro\Projects

Note that the AppData folder is a hidden system folder. Turn on "hidden files" (in the View tab in Windows' File Explorer) to access the AppData folder.

The Projects folder contains a folder for each of your projects. In most cases, this error occurs with the [Default] project - however, you may be using a different project. Open the folder that matches your project name.

If you are receiving an "error loading polygon data", delete the following files:
polygons.geo
polygons.geo.bkp
polygons.sdb
polygons.sdb.bkp

If you are receiving an "error loading geopin data", delete the following files:
docs.dat
docs.dat.bkp
docstypes.dat
docstypes.dat.bkp
Fonts.FNT
Fonts.backup.FNT

Restart Terrain Navigator Pro and the error should no longer appear.

I'm not using Projects. What are they and how can I use them to better manage my layers of markers, tracks, etc.?
Projects allow you to create groups of layers and create efficient use of the features offered in Terrain Navigator Pro. For details, check out:
http://tnp.uservoice.com/knowledgebase/articles/172147
http://tnp.uservoice.com/knowledgebase/articles/315491

I am not a computer expert. Should I attempt to delete these files?
Only someone with moderate computer skills who is familiar with copying, moving, and deleting files should attempt this procedure. If you do not have an IT professional within your organization that can assist you, please call us at 800-627-7236 and we will offer a remote session via a secure Internet connection to delete these files. 

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