I am a Technical Instructor and find Aqua Sketch to be very valuable. It goes on almost every dive with me. For basic recreational diving I find it invaluable for making notes about the dive and communicating with fellow divers. For technical dives the same applies but also allows me to write down my back up tables etc. and have them just a couple of turns of the scroll knob away. This photo was taken on my annual 2 week over the Holidays trip to Cozumel on January 1st 2015 at Paso De Cedral.
Dennis H. Hocker