My mum is off to Libya over the Chrsitmas holidays. Yes I know- long story short, she's keen on historical sights and other interesting architecture, and she likes travelling in the Arabic speaking world as she finds the people friendly.
Anyway, the chap that will be acting as her guide wants her to buy him a sat nav that he can use in his Land Cruiser while travelling around the desert. My mum hasn't the faintest, so as the nearest vaguely tech savvy person, she's asked me.
Now in about 1998 my dad, who at the time was both a spendthrift gadget freak and a hill walker, bought himself a handheld Garmin unit which basically (as far as I can remember) didn't do much more than tell him his latitude and longitude, how fast he was going (I'm still impressed by Sat Navs doing this now, I was well impressed by it in 1998), and, most importantly, give him an OS map grid reference. It may have had a basic black and white map on, but I really can't remember. In a country like Libya, which is massive and doesn't sound like it has much in the way of roads, I'm thinking that's what he needs rather than a generic TomTom type thing (which probably don't even exist for much of North Africa).
I've just had a spot of inspiration and googled for 'Wilderness GPS' which has given me some promising leads on the latest generation equivalents of what my dad had, but all advice would be welcome, or if anyone knows a good forum to ask on? Either advice on a device which would suit off the shelf, or advice on a program I can buy and install on a cheapo Navigo-style satnav which wil make it do what I want (I had a first gen Navigo from Ebuyer and they're dead easy to hack- the unit itself doesn't need to be robust as I understand it).
TIA.
Edit: Budget is about £150.