Global Positioning System (GPS) Navigation Wander

These pictures were created by having my Eagle Explorer GPS strobe $GPGGA sentences out its data ports every 2 seconds. I used MS-DOS Kermit 3.15 to log the approximately 1500 lines of text. I used Multi-Edit to convert all the comma field delimiters into spaces, and deleted extra text. MathCad+ version 6.0 was used to import the data file as a huge array. Lview Pro version 1.0b was used to snag the screen display from MathCad and create these .gif files.

The units on all three axes are in meters. The X and Y axes (surface of the Earth) range over 400 meters, while the vertical axis (altitude) ranges over 200 meters.

Side View
Top View