Heck, the leap in positioning accuracy 4.4k satellites would make gps obsolete. Civilian gps accuracy is low enough that you cannot distinguish between lanes on a highway.
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Do you need to track/tune them all at the same time, or can you mux between them? 12 channel receivers used to be common.
Edit: Maybe this has some answers: http://electronics.stackexchange.com/questions/11884/how-man...