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This widget has been developed to help identify the potential footprint of a GNSS sensor installed in an arbitrary location. Enter the location of the sensor (or drag the marker to the desired location) and enter the height of the receiver above the water surface. You can alter the azimuth and elevation ranges to change the displayed patch and help identify where reflections might be affected by nearby obstacles.
The results provided are based on the outer edges of the first Fresnel zone from GPS satellites - for other constellations results will vary slightly.