: A freeware utility that incorporates advanced features to show the status of a GPS receiver via the NMEA 0183 protocol Capabilities
If the specific J-NAV analyzer is unavailable, these highly-rated tools are often used for the same purpose (extracting and analyzing GPS ASCII files): J-nav Gps Analyzer Download--
Navigate to Tools > Sky Plot . Here, you can see which satellites were blocked by trees or buildings. Red spikes on the SNR graph indicate multipath errors. Use this to decide if you need to re-survey a point. : A freeware utility that incorporates advanced features