I ended up having to use the French ones because the others are either fuzzy, the aspect is completely wrong so the Earth in space, above MoonBase, looks like a Ford logo, or the colours are washed-out.
Once it reached episode 4, it captured what I'd noticed in the past; which is a little ground-based radar, presumably directing the twin laser turrets.

The Japanese version shows it a tiny bit clearer:

I like how the show is full of little bits like this.