“GPS can automate and speed GIS data processing at a lower cost compared with other methods. Several studies have shown GPS data gathering can reduce GIS data collection costs by 50% or more.”

some decent Powerpoint presentations and handouts

“GPS points for all the structures in the five municipalities have been collected. Structures include houses, businesses, fire hydrants, water towers, overhead power lines or anything that could be used as a reference point.”

The entire GPS constellation is now being modernised

inertial geospatial solutions

useful geomagnetic warnings