I think I've got a hack for this - but you can't do it with the App or Car alone - As Far As I Know - glad to hear if somebody has solved this.
Here is the issue:
I've tried a few things for this but I think you may be out of luck for now. As far as I can see locations must be navigable. So if you live somewhere that the car can't navigate to then it selects the closest place.
I am not sure that there is a way to increase the size of the geofence to turn off sentry via the car.
However - there is a workaround using the API to turn sentry mode on and off:
/api/1/vehicles/{id}/command/set_sentry_mode
Sentry Mode
TeslaFi might do it - I don't use it so can't confirm.
If you are fairly hands on with computer you could install
adriankumpf/teslamate it is bundled with an MQTT broker and allows for custom geofencing, so you can put in co-ordinates.
If you are familiar with NodeRed you could "simply" send a message to the car telling it to disable Sentry when in the geofence.
However, the above is not for the faint hearted if you're not familiar with Linux, Docker, MQTT etc - by far the simpler route:
You can of course stop recording by touching the camera icon
Good Luck
