Bry - you're right - you could use one of those pressure pads that they have for laser sights on handguns and assault weapons to power up the thing. You could use a USB memory stick to xfer/store all the data.

I'd just like to see if it's possible to actually create a sighting system that's capable of handling all those tasks, but still small and user-friendly enought to actually perform under field conditions. Hmph.

I live for kicking around stuff like this.