Paper prototyping

Lately I have been trying to sort a good layout for my app. Some things I need to think about going into the development stage are:

-Pin point accuracyof location.
-Bigger clock for user to read (being underwater will restrict screen vision)
-Remove the social aspect of my app and concentrate more on nailing the buddy and spot system
-Add safety aspect of notification/alert messaging system that buddies can use whilst out diving
-Track spots/buddy