Hi, Amanda's other half here!
We really love geocaching, we've found 25 now! It's a fantastic way of getting the kids out in the country, our two DDs (6&4) call it 'Treasure Hunting'. I get the 6 year old to decode the encrypted hints as a 'code' - so it combines Maths, English, Geography, Nature and Exrecise...It's also a good way of getting shot of all your cheap plastic giveaway toys etc.[]We've got a basic Garmin ETrex (c£100 iirc). Not sure about all the loading of co-ordinates straight into the machine, I'm not techie at all (not all men are you know!)
What we do is....
Each cache on the website has TWO sets of co-ordinates, the GPS ones eg 51 11 234N 001 87 878W and the National OS Grid ones eg 61345 51234. If you have an Ordnance Survey Map of your area 1:25000 (green or Orange) is best but 1:50000 (Pink) will suffice then you can work out from the OS grid roughly where the cache is, so you can get pretty close from that.
Then go into the machine and go to 'Mark Waypoints' (you can do this anywhere) and it will create a new waypoint with the GPS co-ords of where you are; then edit this waypoint to the co-ords of the cache; then select Goto and it points you to the cache!
Oh dear I've made that sound really complex -it isn't really; we just use 3 of the commands on the Garmin and paper maps for the rest. Still I'm sure there are easier ways with the pre loaded maps just haven't sussed them!