My third gen iPad and Memory Map, despite the kind of "General" GPS locations when not using a Bluetooth GPS recevier, and the dreadful, position every ten seconds issue, is great.
I particularly enjoy using the track facility to see where we have been, when I get home.
If there was a way to get it to record a position every second, it would be so much better.
I'm thinking of buying a combined kneeboard/ipad holder.