A GPS does not replace the map; it obtains lat/long information from satallites, and overlays that dot on a digital topographical map. Lat/long without a graphic representation is useless. The paper map is the GPS base map: a backup that cannot go dead. Topo map and GPS are synergenic. To fully use either you must learn to interpret contour lines to relate the 2D image (digital OR paper map) to the 3D scene in front of you.