In reply to StuDoig:
I'm in the same boat. The Fortrex looks good and is lighter than the other Garmins I was considering. Takes the same batteries as most of the head torches I've seen lately.
I like the idea of a large display of the grid ref, and am surprised you cannot programme something like the etrex series to automatically start up by displaying it in large font. However, if I cannot see the tiny screen details without my glasses, how will I need *just* the grid ref --- I won't be able to apply it to a map as I can't see that detail either. So I am thinking the only time I would need a large grid ref is when I was telling someone else, such as rescue, and so on.
There's also the point that the weight of a garmin 20 with maps is the same as the basic 10, so if you lose the map you might find it easier to finish the journey with the 20 and topo maps etc. But if you lose a map, should you really be trusted with advanced technology?