I got this sw update and the interrogation scene of the movie, Marathon man came to my mind:
"Is it safe?
Yes, it’s very safe, it’s so safe you wouldn’t believe it.
Is it safe?
No, it’s not safe at all, it’s…very dangerous, be careful"
My bet is that it must be related to Compass and some sort of database used to define in which direction exactly magnetic north is exactly at each location on (and around :-) ) the Earth.
But since I have never ever seen this sort of sw update I felt it was necessary to ask whether this update was really intended or just a fake update that I once saw for Edge 530 (I mean Routable map for 530, while with this device one cannot generate routes using addresses)