- - Instrument for measuring the angular distance between celestial objects
- - It shoots the sun.
- - Used to find one's way when all at sea
- - Part of circle succeeded — still surviving
- - surviving son positioned first navigation aid
- - Nautical measuring instrument
- - Nautical instrument for measuring angular distances
- - Seafarer's navigation aid
- - Navigation instrument
- - Instrument for measuring angular distances
- - Navigator's tool
- - Instrument to fix a ship's location at sea
- - Mariner's device
- - Seafarer's instrument
- - 32 Down successor
- - Astrolabe alternative
- - Astrolabe descendant
- - Navigational tool
- - Mariner's instrument
- - Navigators' instrument
- - Sailor's aid
- - Mariner's tool
- - Mr. Midshipman Easy learned its use.
- - GPS ancestor
- - Navigational instrument
- - Navigator's need
- - Navigator's aid
- - Navigating aid
- - Navigation device
- - Old time GPS
- - 15's instrument not destroyed after onset of storm
- - Optical instrument
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