Matthames said:
If it were me, I would use both, but not relying one more than the other.
Satnavs can lull you into a false sense of security. TBH if I were in your shoes I would probably use a simple GPS receiver which you can program in some waypoints. You can then combine this with using maps to plot out your route using the best path. By combining both, if the GPS packs up in the middle of nowhere, then you will always have your maps to fall back on.
It worries me the number of people who rely on satnav for their navigation. It should be treated like any other forms of navigation as merely a tool.
Very good advice. I have memory map on my Mio PDA with OS maps loaded.
I use this for hill walking (an activity at which I am very experienced). At first I used to take this and paper maps. But as I got more and more confident with the PDA I started to use the paper maps less and less, until I eventually didn't bother with the peper maps anymore. This worked fine for ages until one fateful day.
I was hill walking in the lake district on new years day. The weather was dry, but very cold. For the non-engineers among us, the cold seriously affects battery performance. I was late starting my walk due to getting up late and traffic problems. You can see where all this is going. I was about 3/4 round my circular walk, and it was starting to get dark. So out came the head torch. Then I got the dreaded "main battery low alarm" on the PDA. Not long after that, the battery failed completely and I had no map, and the light was really starting to fade very fast now. So I decided to make my way down immediately using a compass bearing instead of finding my planned decent path, as getting off the hill anywhere is better than being benighted on the tops. Then my headtorch started to fade, then soon after I was in total darkness, as the headtorch batteries failed. I am still quite high up (>2000ft) and on rough, steep ground, and lost. After some rather unsucessful attempts at walking using my phone as a torch, which resulted in a few falls (not serious, but worrying nontheless), I had to swallow my pride and call out mountain rescue. It was extremely embarassed and apolagetic but also very greatful (so much in fact that I sent the MRT a donation, which though generous no doubt did not cover the cost of my rescue). I now always carry a paper map (and spare batteries).