Set trip boundaries

[pgmccann]

Location tracking is currently functional, with individual points be recorded in a database table. These are not grouped into fishing trips.

When a user starts tracking their location, this will usually indicate the start of a new trip; when they stop, that indicates the end. However, it is possible that a user might temporarily stop and then resume tracking their location during a trip. Conversely, they may make multiple separate trips in quick succession. They may also forget to turn off tracking after a trip. The users fish at night, so trips may run over midnight, from one day into the next. We can assume that each fishing trip takes within a period running from 12pm one day to 12pm the next.

Proposed algorithm:

1. User starts tracking location
2. Are there any existing trips recorded?
   a. If not, record the start of a new trip
   b. If so, did the most recent trip end before the most recent 12pm?
   i. If so, record the start of a new trip
   ii. If not, ask the user if this is a new trip or a continuation of the previous one