Possible Clues:

• Pt. of USNA
• Part of USNA
• ___ system (GPS device)
• Service abbr.
• Sat___ (GPS system)
• Part of U.S.N.A.: Abbr.
• Part of 11-down: abbr.
• Fleet-related: Abbr.
• GPS task, for short
• ___ system (luxury car option)