Welcome to the GNSS Positioning Performance Monitor.
Select a constellation and time period from the navbar above, or click on a plot to view detailed information about a constellation.

Please note that all data is delayed by 24 hours before showing up on this website.

This website is located in Athens, Ohio in the United States. The Galileo and BeiDou constellations are not yet fully operational in our area.

First Time Users: Please see the Getting Started Guide

GPS, GLONASS, Galileo, and BeiDou Horizontal and Vertical Position Error