Because they can teach you astronavigation, but they can't give you a rocket.    From Wordnik.com.  [About Clarion applications] Reference

Some candidates are interviewed for the job of astronavigation, and it turns out that one of them is a geocentrist.    From Wordnik.com.  [Politicians and Critics] Reference

Midguard explained that it wasn't necessary to be a pilot to run the ship; any person who knew a smattering of astronavigation could get to his destination by simply telling the ship what he wanted to do.    From Wordnik.com.  [A Spaceship Named McGuire] Reference

Julius Caesar, but in a certain uniqueness of mankind's own behavior: a uniqueness which is to be adduced from in our species 'unique, historical concern with ancient maritime culture's mastery of universalized astronavigation as such.    From Wordnik.com.  [LaRouche's Latest] Reference

3 Iki Piki: This could be the single most spectacularly jaw-dropping feat of astronavigation the universe has ever seen.    From Wordnik.com.  [Irregular Webcomic!] Reference