What does 'check in' mean?

In the Rail Planner App, checking in helps you track your trip as you go. Ticking the ‘check in’ box will add a journey to your My Trip map as a solid line. This helps you keep track of the journeys you’ve planned and the journeys you’ve taken or intend to take. Don’t panic, though – you can still change your plans in My Trip after you’ve checked in.

You can use this to help you fill in the travel diary that comes with your Pass. Remember, your Pass is not valid for travel unless you’ve filled in the travel diary correctly, so make sure you know how to do it before you go.