I know that some TTR owners use Road Angels for route planning and navigation so I hope you don't mind me posting these "for sales" items here.....
Protect your Road Angel with this brand new genuine Road Angel accessory - a leather case - got a few here to move on - £3 each.
AND.... if that's not enough for you, how about treating yourself to an air vent mount - a genuine Road Angel accessory. If you are learning to use your Road Angel for trail routes then these are ideal. Put a route on the RA, stick it on your air vent mount. Follow the route and then check you have a tracklog to download to your PC or laptop. Easier to learn to use the RA in the car than on a muddy bike when you are depending on it