I conducted a user survey and was able to get a large group of people to participate in the user survey 94% were active golfers, We had a larger ratio of men to women but that is not that surprising considering women only comprise 23% of golfers.
based on the survey there would be a good market for this app, the main feature would be the app acting as your caddy and recommending what club to hit based on your distance to the green, using past recorded data of how far you hit each club.
For this app to be successful it would also have to provide GPS positioning and give distances to the green and hazards from anywhere on the course. It should be able to keep track of a users score as well as the potential 3 other playing partners and track not just the score but ball direction, the club used, sand shots, and penalties. It would ideally be able to calculate handicaps and move to the next hole automatically after putting in the scores.