Preliminary Gemini 4 Crew Debriefing, Part II, 1965

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Orbit Navigation Checks was
a very good scheme.
The control mode we used was Pulse, and the
timing was just the GMT timing we had in the
spacecraft.
I ' d like to have Ed discuss a
little of the technique now.
White
Actually we had a form in our book that we had
made up to make these tests, but I think it
became apparent to both of us as we came along
that this is a fairly simple thing to do.
If
you want to just try to update your map without
having an update from the ground, it was
quite simple to point the spacecraft straight down
to the earth and get a point which you could
recognize on the ground., and actually plot this
right out on your orbit map.
I think we could
probably make checks in this manner and update
our map almost as well as we could by having a
longitude and time called up from the ground .
I 'd like to make a comment right now that I
thought the little map that we had with the
orbit plot on it was
very useful, but it
was weak in one respect; I was always wanting
more detail on what I was seeing doWlll there.
We,fortunately,carried a map with about two to