mmm, what would a bad map mean? The less features you have, the less important the map becomes (that is a bold statement, I know). Features are always there to some extend. But, how would 300km2 of African Savanna look like on a map (to be honest I have never seen that). To some extend you will have big features like rivers, hills, mountain ranges, vegetation coverage, roads. You can almost always find a map, even when scales like 1:1000.000 or smaller. You will have to work with dead reckoning, measuring distance and direction, plotting where you go. So, it is more on navigation skills then the map only. I would take two GPS devices in such area's and a small scale overview map, program the signification freastures into both devices, making sure you can correlate map with gps postion. But, there are a few people here who actually have experience with this.