I really apologize myself I was not there. :(

Check Topographer or Topographer Pro for Android.

Maybe you, but I have different experiences. There are many of inkjet printers (better say inks) which are waterproof. The best I know is DuraBrite ink of EPSON. One may print on normal plain paper it is still waterproof. If you need something as ToughPrint you may use impregnation as described...

What to make an independent system? LiIon/LiPol accus for electricity from wind energy are not so expensive now. Vertical axis wind turbine + generator (200-500 W) are available  from China, you need regulator and convertor. Probably an accumulator for hot water too...

I have one of the first series of Scurion. I used a reverse mounting on helmet as it is reccomended in user guide, so the screws of metal case are direction down and cable is mostly inside of helmet. Just to prevent any possible contact of screws with ceiling or bedrock or clay. By my...

I'm sorry, but why LRUD? You may draw exact section with help of splay shots. LRUD is help in situations you have not real section. And it is not easy job according the Dave's picture :)

Makita has 18 V 5 Ah batteries too, but all its drills are more heavy than Bosch 2.6 - 3.3 kg.

There are two kinds of motors there - one with brushes and second one with electronic control (EC for Bosch). The difference is about 30 % more power from the same battery with EC.

Bosch GBH 18 V-EC PROFESSIONAL, 2.6 kg, 5 Ah Accu: GBA 18V 5,0Ah M-C

To protect your hand: 0.5 kg dumbbell: http://www.sportisimo.cz/keller/jednorucni-cinka-0.5kg/8698/

Ariane - the queen of darkness - as we told here (Czech Republic, Slovakia). We use, or used, mostly the acetylene generators with injection of water into carbide chamber. Much better than gravity system. Simplest system was made from two empty spray cans, quite complicated and expensive was...

It is panic function, not normal use. There is not any reason to control normal descent this way.

It is not Singing Rock, it is anthron ;) http://anthron.si/index.php/zavora-dsd-plus.html There is impossible to load a rope from the opposite side. I have it.

Alpenverein - for all the Earth including North Korea. http://www.alpenverein.at/portal/service/mitgliedschaft/mitgliedervorteile/membership-english-version/0100_insured-worldwide.php http://aacuk.org.uk

Only UPS has certification. Only one company has them: PowerStream. 20 pc is minimum according shipping price.