UNAVCO, the community and facility provide critical services for many natural hazards preparation, response and mitigation efforts. GPS/GNSS data, especially from the Plate Boundary Observatory in the western U. S., is necessary for timely and accurate earthquake early warning systems. Combining seismic and geodetic data, now termed seismogeodesy, is essential for large magnitude earthquake early warning and tsunami early warning. Recent geodetic data analysis has shown that a tsunami creates a disturbance in the ionosphere, essentially a wave of high energy particles that precede tsunami wave arrivals across ocean basins and thus provide a warning mechanism in advance of any buoy or coastal arrival, giving more time for communities to prepare for the oncoming waves. Other examples of the use of geodetic data for hazards such as volcanic unrest, severe storms, hurricanes, flooding, landslides, wildfires, drought and space weather will be presented.