I could help you with how to share one GPS signal among multiple mapping software applications on the same computer, but that doesn't sound like what you're looking for.
You have several GPS receiver units, which all accept external antenna inputs, and you want them to share the same antenna, right? Before it reaches the GPS, you still have an analog signal, so I suppose maybe there's some kind of antenna coax-splitter widget out there, but I'd be afraid an N-way splitter would decrease the signal strength N-times.
-- Geoff
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