When you create a new trip, you can choose which trip type it is. The trip type is used, among other things, in the generation of routes.
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Hiking trip
Used when you have neither car or anything else. Routing is done in pedestrian mode.
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Used when the main means of transport is boat. Routing is done in pedestrian mode.
Long trip
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Used on longer trips, usually by plane. Routing is done in pedestrian mode.