I'm currently working on the same thing. My direction looks like this: N 58-56-54 E (meaning 58 degrees, 56 minutes, and 54 seconds east of north, in case you didn't know. I just found out). I remember the add button being grayed out when I left out the first N/S (e.g. 58-56-54 E). Maybe your direction type input needs the degrees formatted like mine. Not sure. Hope it works out 🙂