When GeoTiIFF files of topographic maps are loaded in an Android device running OA, it gives an excellent tool for trekkers.
For example, USGS Historical Topographic charts
are available from here
The latest versions of GE2KAP
can be used to create .kap charts
from the downloaded GeoTIFF files.
I have loaded my Samsung Galaxy Note2 with a chart of the Napali coast on Kauai
. This is a trail I hiked and camped in the 1980s. Here are some screen
shots from OA showing the trail, marked as the lighter dashed line.
I wish I had this capability back in the 80's!!