Have you looked into ClassFlow? It is a cloud-based presentation software geared toward classroom whiteboards. Some key features include: 1) Presentations are stored online, so you can access from work or home 2) Interacts with student devices including iPads, Nexxus tablets, laptops, etc for interactive features including polls, question/answer, and more. 3) It's FREE (for now) 4) It meets your requirements for handwriting recognition and and the ability to create templates. I've been using SmartNotebook and ActivInspire (from Promethean) for years, and I think ClassFlow blows them both away.

In my previous life assisting in scuba classes, I saw many "tourists" training so they could dive on a vacation. Training in this sport can easily make the difference between life, death, or permanent injury. Training before you go on the trip is MUCH safer than taking one of those 1-hour crash courses.

Now, if this device is operated in shallow water (20-30 feet), there should be little risk of the bends (decompression sickness) because it would be hard to stay down there long enough with a single 88 cft tank. IF the device is positively bouyant (I couldn't find any such claim on their site), it would float to the surface if the battery went dead. Regardless of the illusion of safety/comfort this device may provide, it is no replacement for training, supervision, and experience.