Locate an entrance door from anywhere in the garden?

I'm wondering what would be the best tool to locate a door in a private space (a garden).

1. Using sonarvision, add a new address corresponding to this door and mark out the location of the garden and house on the SV editing platform?

2. Without sonarvision: an airtag, or other object locator, whose ringing can be triggered via the smarphone. In this case, you're guided by sound alone, which is less precise.