Related Clues:

• See 35-Down
• See 70-Down
• Part of a network, often
• Traveler’s check?
• Fuzzbuster's detection
• Place holder?
• Perot prop
• Navigational system
• What some detectors detect
• Planetarium display
• Fire sign
• Source of waves at sea
• It may give a reflection on a highway
• Navigator's aid
• Ship salvager's aid