GPS can provide highly accurate measurements using existing infrastructure and relatively low cost hardware. It also makes the results highly auditable since th

GPS can provide highly accurate measurements using existing infrastructure and relatively low cost hardware. It also makes the results highly auditable since the GPS (and assisted GPS) system is public and well-documented, and open, standards-compliant methods exist in the surveying and DAQ industry for working with GPS data. Laser gates certainly have advantages, but they require more setup and ultimately I am skeptical that they would provide more certainty than GPS results. As mentioned elsewhere a survey GPS receiver can produce raw data which can be processed after the fact as a form of audit, something not really possible with laser gates.