I understand your privacy concerns. I didn't like it when my audio book reader wanted access to my contacts. As such, I put a lot of effort into avoiding unnecessary permissions in order to respect your privacy. Additionally, we don't sell or give away any location data from your device.
That said, we still need access to a couple of permissions but we only ask for access to these permissions when we require them in the app.
Feel free to contact me if you have concerns.
Storage access is needed to import and export your places and graphs to the SD card. Access to this storage is only asked when you try to import or export via Settings.
To find your initial location, we use the IP address of your phone to guess the location of your network provider, so we don't have to ask for location permissions. We only ask for location permissions when you turn on Travel Mode so your location can be updated as you move around.