Not only that, GPS jamming can be overcome with better antennas (phased arrays of such, even retrofitted to existing commodity receivers) to eliminate jammers which are not more-or-less directly above the vehicle.

Excellent article on anti-jamming:

http://gpsworld.com/anti-jam-technology-demystifying-the-crp...

> CRPAs work by exploiting spatial diversity; that is, making use of the fact that the desired satellite signals, and the unwanted jamming signals, generally arrive from different directions. In simple terms, you create a spatial filter, one that removes signals that arrive from particular directions, whilst letting through signals from other directions. To achieve this, rather than use a single antenna, we use an array of antenna elements.

Well, yes. Maps aren't accurate (when it comes to moving foliage, as in the video, there maps are out of date within seconds, less in strong winds). Maps don't include many things that are moving, and maps just generally don't work very well at small scales (like the scale of an, even a large, UAV landing)