I looked around for more information on the Silva compass. One page I found mentioned it was "the first and only digital base plate compass that will take a bearing from a topographical map". Well, I couldn't visualize how do that, so I poked around on the Silva site. Found a PDF of the instructions that come with it. For "taking a bearing from a map", the first instruction is "Align the N arrow on the map with North".

Sheesh. I gotta turn the map?