So I note the original poster has not come back. Retort?
Or is this yet another uni project where one seeks free advice to help one pass with minimal effort?
BTW free advice forthcoming
"app" is short for application. MS Word is an app. So is MS Paint. Now it has lost its coolness - you will not make $100000000 from an "app" just by calling it an "app" and telling everyone it is good. You must identify a need, then make a solution.
The trouble here, is we have no NEED to find everyone on the planet who may want to go for a wind/kite/conventionalsurf at Jones' Beach NSW at 0736hrs Sunday 24th May 2018
Nor do we have need to find out who in a 50km radius likes to ride a tractor tyre behind a boat, or wants to learn to paddle a mal.
You can thank me later.
.