How to use GPS to synchronize measurement at 2 different locations.

The error of the starting time may < 10ns.

Hi,
You could use two cheap Garmin OEM GPS 18x LVC receivers for around 80 USD each (https://buy.garmin.com/shop/shop.do?pID=27594&pvID=14555).
They "have bare wire for connection to a variety of
applications; can output data in NMEA 0183 format (industry standard)
or proprietary Garmin format; provides a pulse-per-second logic-level
output with a rising edge aligned to within 1 microsecond of UTC time".
You should connect TTL PPS signal to the Counter Input of the DAQ Card and use it as a trigger or timing source. On RS-232 interface you have ASCII info about position and current time (every second). Version 5 PPS is also available.
Details about using GPS for DAQ sync could be found on NI pages. Try "GPS synchronisation.
Important: selecting receiver look for PPS (Pulse-per-Second) signal availlability. 
My app. runs on two PXI's with DSA cards and PXI-6602 as a GPS18xLVC timing interface.

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