Looks like I'm going to have to swap out my auto dock for a surface scanner, Bummer I hate looking for landing pads....
You do know that your compass points to your assigned pad as soon as you are inside a station right? Surface ports and outposts it points towards as soon as docking permission is acquired.
Nothing else to do except look at the planet data in the system map to see what percentage sulphur is present in, obviously the higher the better.