Related Clues:

• War room items
• Hwy. nos.
• G.P.S. output: Abbr.
• U.S. 1 and others: Abbr.
• GPS output (h)
• 1 and 66, briefly
• Map nos.
• GPS info
• They're on the map, briefly
• Some highways with nos.
• Explorer's aids
• They're often followed
• Cartographer's output
• Postal beats, briefly
• Items in an airline magazine