My �5 solution to not getting lost
 

Picked up a compass on sale from my local camping shop. Drilled 4 corner holes in the base plate and mounted it on my front disc reservoir. I added a bit of rubber between the compass and the metal reservoir to ensure the compass not being affected. I used the thin insulated wire used for stringing up plants. At this price, I don't care if someone takes it as its easy to replace. No power needed and it works every where. Doesn't replace my satnav, but its quick and easy to see even when you're riding. Old South African saying that you can fix anything with a piece of wire and pliers. Well this is my one.
http://i1311.photobucket.com/albums/...psnnni1ekm.jpg

Slightly more angled picture of where I ran the wires. There is a recess, which is great for keeping the wires in place.
http://i1311.photobucket.com/albums/...psgrgqdt6a.jpg

Neat Jacque! , nearly as good as my hot water bottle comfort seat!. Steve

If you don't get lost you may not need to revert to the long distance saddle.

I double sided velcro taped one to the flat bit just behind the screen. It's all over the place when I'm riding but settles down when stationary.

Jacques, are there not any electromagnetic fields from the bike affecting the compass when you ride ?