Your 10th objective (out of 11 in total) is to find a coordinate.

(example coordinate: 29.979523, 31.134202)

part 1 of the coordinate in this example is 29.979523
part 2 of the coordinate in this example is 31.134202

Solution Objective #1: 17 (seventeen)
Solution Objective #2: 1787
Solution Objective #3: Stonehenge
Solution Objective #4: Mine Clock Og
Solution Objective #5: Maenclochog
Solution Objective #6: Rhostwarch bed & breakfast
Solution Objective #7: Visitors
Solution Objective #8: Cherbourg (ferry from Poole to Cherbourg)
Solution Objective #9: Gatteville Lighthouse