Solution
You can acquire GPS location information using PXI-6683 or PXI-6683H, including longitude and latitude in degrees and altitude meters.
NI-Sync provides the shipping example GPS Location Velocity.vi that shows how to use the GPS functions.
The shipping example can be found by navigating to the Help tab in LabVIEW >> Find Examples >> Hardware Input and Output >> Timing and Synchronization >> Time-based >> GPS Location and Velocity.vi