Booking without a specific destination will vary depending on the fleet you are wanting to travel with.
Taxi (Black Cab)
Taxi (Black Cab) fares are calculated via a meter, they can be booked on the FREE NOW app without entering a destination. This is due to the total fare being calculated at the end of the trip.
Ride (PHV) trips operate on fixed fares so a destination address is required at the time of the initial booking.
For more information on making detours or adding extra stops during your trip, please read the following article.