Sextant
There was no "captain" for the astrolabe. It was navigational tool used on the ships to guide them. The captain of the ship or the pilot used it.
Probably not. However, as it is an easy to identify grouping with several bright stars, it's certainly feasible that some of them were used on occasion by ships to help fix their position.
Douglas Ward has written: 'Berlitz 2000 Complete Guide to Cruising & Cruise Ships' 'Berlitz Complete Guide to Cruising and Cruise Ships (Berlitz Complete Guide to Cruising & Cruise Ships)' 'Berlitz 98 Complete Guide to Cruising and Cruise Ships (Serial)' 'Local associations eye instruction and professional development' -- subject(s): Education, Societies 'Berlitz 2005 Ocean Cruising & Cruise Ships (Berlitz Complete Guide to Cruising and Cruise Ships)' 'Berlitz Complete Guide to Cruising and Cruise Ships 2002 (Berlitz Complete Guide to Cruising and Cruise Ships, 2002)' -- subject(s): Guidebooks, Cruise ships, Ocean travel 'Berlitz 2007 Complete Guide to Cruising & Cruise Ships (Berlitz Complete Guide to Cruising and Cruise Ships)'
star tool
stars
a light house
Navigate
Well that's a good question. You could travel using the stars as a guide by following the stars. They can guide you to where your going.
Moon
A speed square or rafter angle square is a tool that can be used as a saw guide. The purpose of this tool is to guide the saw when making short 45 and 90 degree angles.
Well that's a good question. You could travel using the stars as a guide by following the stars. They can guide you to where your going.
plot the ships position