Some Polish cavers have developed the CaveSniper for Cave Surveying.

http://www.caveexplorer.eu/index.php?k=11&lang=en

Does what the Shetland Attack Pony did plus Bluetooth logs the Disto distance as well.
Offers quite a few display statistics of the cave with multiple data outputs.

Cost is 900Euro plus the cost of a Disto A6 or Disto D8.

Kewl! Out of my affordability range though....  Maybe in the future if I get a better job....