Does positioning new petrol require mobile data connection

I regularly travel in regional areas of Australia where I have no mobile coverage, but GPS works fine. When trying to add a new fuel station, by selection on the map, I am unable to add it sometimes, and it appears to be when i have no mobile coverage? Is this correct? I should not need mobile coverage to add a new fuel station, as long as I have GPS coverage. It should just sync next time I come into a coverage area.