Mobile App v1 - Pick the 3-5 features you want first

Details

The mobile app would be a big lift, so I'd want to build the smallest version that would be actually useful as a v1 and expand from there afterwards. Let me know in the comments if this is something you would use and what your top features you'd want to see in the app to make it useful for you in v1. Comment with your top 3-5 picks (by letter): A) Dive logging (fast log flow) B) Map discovery like on desktop but a mobile map etc. C) Dive spot pages (spot details + directions) D) Destination/country pages (travel planning content) E) Friends (add friends, see buddies) / Messaging F) Offline mode (save spots and draft logs offline) G) Push notifications (trip overlaps, messages, updates) Also include: - iOS or Android - How often you dive (weekly / monthly / a few times a year) - If you could only pick ONE thing, what would it be? Anything else you'd prefer in here outside of the above feature list?