Possible Clues:

• GPS heading
• Compass hdg.
• Phoenix-to-Flagstaff dir.
• Houston-to-St. Louis dir.
• Capt.'s heading
• Fort Myers-to-Orlando dir.
• Florencia-to-Bogota dir.
• Compass letters
• Austin-to-Waco dir.
• Butte-to-Great Falls dir.