### Application files

This package and its subpackages contain the application files that appear in the IMG file-system.

The files that will be supported are

TRE
  The tree view of the map that is needed to make sense of the rest of the file. A map is divided into a number of different levels of detail. At each level of detail it is divided into a number of areas (called sub-divisions here. In general there will be more sub-divisions at the better zoom levels. Each subdivision points to the ones in the zoom level below it.
RGN
  This file contains the definitions of the points, lines and polygons. They have to be read in conjunction with the TRE section however, as they don't make sense by themselves.
LBL
  This file contains all the text lables. Other files refer to the labels that are defined in this file.