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If you have to use GT (and yes I do love both, but not together:nonono try Compendium II, it has the rules for mass combat and some other stuff...only have C1 and of course the all too necessary GURPS Space. I haven't checked out Vehicles or Robots, so you're on your own there.
I use my personal modification of the starship combat system from Gurps Traveller. It works well for me to play out tactical engangements of a handful of starships.