There are no Categories usable for mapping (viewers, editors, GIS), navigation and GPS utility software (visualisation, logger utilities).

Nearest fits for Map viewers, editors and GIS (pretty far):
Graphics;2DGraphics;
Graphics;2DGraphics;RasterGraphics;
Graphics;2DGraphics;VectorGraphics;
Education;Geography;
Education;Science;Geoscience;
Engineering;

For GPS utilties (again pretty far):
Settings;HardwareSettings;

Due to lack of proper classification, several software vendors started to use unofficial:
Graphics;Maps;


Spec should cleanly say, which category should be used for this type of software.

Possible solutions:
a) keep everything as is, document mapping software Categories: Geoscience or Geography (ugly)

b) Introduce new category: Mapping, Maps or Navigation with allowed secondary categories Graphics, Utility, Education, Science, (and maybe Research, see bug 20186)

b1) New category should be recommended for GIS as well.

b2) GIS can be documented as Geography or Geoscience

b3) GIS should be a new secondary category.

b4) GIS chould be related to Engineering



References:
bug 20186
http://sourceforge.net/tracker/?func=detail&atid=570956&aid=2116042&group_id=83870
http://lists.freedesktop.org/archives/xdg/2008-September/009969.html