I'll look to redo the UI so its more straight forward..hopefully. in the meantime...
There are 2 ways to set the coordinates for a Trek or Gathering.
1. Enter the Address of the place, etc. Click the "Find" button next to it and it will do a lookup and automatically enter the Lat/Lon values in their respectives boxes. If it cannot find the address, it will alert you and you can try a different spelling, etc.
2. Enter the Lat/Lon in decimal format directly and click its "Find" button.
Its key to click the find button so that it can actually set the position on the map.. once you see its in the proper location and the Lat/Lon fields are filled out, then you are all set.
I'll look to redo that section a bit so its more straightfoward, maybe also allow Hours/Min/Seconds entry format too.