In reply to Malpractise:
Hi Mal, I've been working with D of E groups for a while. I would definitely attempt to plan resources, it helps to give you a tick list in your head but as always when working with young people have about 3 different things up your sleeve. If you have a google about teaching navigation there are some good ideas around. Some ones which I have used in the past have been:
1) making a model of the topography represented by a grid square using something like playdough (you can make it really easily yourself). Make sure you pick features which are fairly easy to model, e.g. hills, cwms etc.
2) there is a website ( I can't remember what it is called at the moment) but their aim is to load a picture of every grid square in Britain. I've used that one by printing off pictures of the features and cut up a copy of a map and asking them to match them.
1 and 2 will get them thinking about how contours relate to the features, something which, I think, is one of the most important skills to learn.
3) Ordnance survey do flash cards with map symbols, you can play loads of games with those, particularly good for Bronze groups in rural areas where they walk through villages a lot. At least then they can match up a church on the ground with a church symbol.
4) When you want to teaching pacing and bearings if you have a piece of rough ground or something equivalent get them to hide sweets for each other and say what bearing and how many paces it is from a given start point.
Make the sessions as interactive as possible, try not to just lecture about cooking have a cooking competition allowing them to try out different foods and find out what they like. Also be really strict with the weight of their bags, they will hate you to start with when you ask them to empty out the hair straighteners, 30 chocolate bars etc but they will enjoy it so much more! Try and get them to love the hills/mountains, most of them are doing it for UCAS/CV but there will be a few who genuinely love it. If you're enthusiastic some of it may rub off, maybe, possibly!
Hope that wasn't a patronising list, I wasn't sure whether you had done anything similar before. If you want other ideas let me know, I can probably come up with some more if I think hard enough! Hope that helps