Surface Pro 3 USB Question

Just bought some Surface Pro 3 tablets for my fire department to use on apparatus. The surface pro 3 only had 1 standard USB port. We need to have 2 devices connected (A gps antenna and a Verizon Jet pack for wireless internet)

If I bought a hub to use, would this work ok? The reason I am asking is.... the jetpack only needs to plug into the USB for power to keep it running. I know the older USB ports would have 2 cables connecting to computer if you wanted power use
 
Is the GPS also powered via USB? It should work with just those two devices, but since they are both high powered devices you may need a powered USB hub.
 
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