i have been planning a route for a while – off road with a night in a bothy shelter up in the Cairngorms …. so was all prepared to pack and then take OS maps. But I recently bought an eTrex 30 from Garmin and a SD card with the OS maps of the UK on it. The idea is that this is my primary nav aid (although will have compass, OS map and another gps with me)
So starting using Basecamp as well – this has improved a ton since I last looked at it years ago – it helps having the etrex connected or the SD card plugged into the computer because then you can use the OS maps. If only basecamp let you use google or bing or satellite pictures as sometime you can see a trail that is not marked …..
Will report back on the eTrex once i have used in anger – all I can say so far is that the bike mount is not the most sturdy …
Kite*Surf*Bike*Rambling 
Cycled this route quite a few years ago. Fabulous scenery but be prepared to get wet if the rivers are up. Did it in a day, but it’ll be more fun bothying. When are you going?
There’s also a route back over the Gaick pass, http://www.mtbtrails.info/Trail_Venue.aspx?VenueNumber=106, if you want a circular route.
good link – thanks for that
That is brilliant – I am now trying to loop them together – a bit of NCP at the end but think that will be fine when so tired.
Was GOING to do it fairly soon with fat bike on snow – waiting for clear day – think it will be pretty wet
There’s another shorter route coming back by the Falls of Bruar (worth a look if you’ve never been there). It’s on the same site, maybe from the north side? The rivers could be ‘interesting’ if there’s a big melt.