• Abaft
• Abeam
• Aboard
• Above Deck
• Abreast
• Adrift
• Aft
• Aground
• Ahead
• A-hull
• Aids to Navigation
• Alee
• All Standing
• Aloft
• Amidships
• Anchorage
• Apparent Wind
• Astern
• Athwartships
• Autopilot
• Auxiliary Power
• Aweigh