Instant map calibration from a picture
It happens quite often when travelling that you stumble upon good trail maps for the current area, either in tourist information centers or on signs at a trail head. How great would it be if I could simply snap a picture of this map and instantly use it in Locus. Of course it wont be as accurate or pixel perfect as something prepared at home, but I will be a hell of a lot better than a mostly empty openstreetmap area.
How would it work? Locus must support receiving images (jpg,png,etc) from other apps. Once it gets an image, it copies it into its maps directory and jumps into "calibration mode". Calibration mode could be done by placing a few previously-known waypoints on the correct spots in the image. Or alternatively, by rotating and x-y-zooming the (semi-transparent) image on a previously existing map of the area until it fits.
I know this has a million theoretical issues with projections/accuracy/resolution/etcpp, but these will not really matter since the area in question will be rather small.