So, I had Election Day off, and some of us went ridgewalking. (Yes I did vote. Early!)
Anyoldway, one person had a digital camera with a GPS receiver built in. Everytime he took a picture of a karst feature, he also got a location.
Once back at the old barn, we downloaded his pictures and got three files for each pictures. One was just a simple jpg, the other was a picture stamped with the time and data, and third had an accompanying file that gave the time and date, the location, and various other things, like the PDOP.
We then downloaded the created shape file into Arcview, and viewed a map with all our picture locations plotted. This also gave us the locations of the karst features we had seen--which included three caves.
The final step was to take the digital map, locate the correct locations for the new-found features, and get the correct coordinates for them.
It was all very modern!!
But at least the computer gave the coordinates for the corrected locations, so I didn't have to figure up the latitude and longitude by hand.