You can import Google Timeline data, extracted via Takeout or from your phone, GPX, GeoJSON, .rec (OwnTracks’ format), KML and KMZ, so if you have some existing data, we got you covered. On iOS, there is also an option to import GPX tracks from your Apple Health, but this is a paid feature for self-hosters. It’s available for free for our cloud subscribers though.

As for the whys: It’s good to have a way to see where you’ve been at some point in time or when you visited a certain place. It’s also useful for reimbursement purposes, for example I use it to see how many days I worked from home and how many days I went to fork from the office, so I could properly file my tax report and get tax reimbursement. Or to get reimbursement from my employer for a business trip