different between astronavigator vs astrogator

English

astro- +? navigator

astronavigator (plural astronavigators)

astrogator (plural astrogators)

One who navigates through space.
- 1956, Andrew North, Plague Ship, New York: Gnome Press, Chapter 9, p. 94,^[1]
  He went over and over the data of the course the Astrogator had set.
- 1984, Stephen King, Beachworld
  Shapiro, the astrogator, weighed a hundred and forty pounds and stood five-five. Physical combat was not his specialty.

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