Evaluation of the Garmin GPS III Plus, DGPS Products,
Services, and Equipment, Garmin MapSource™ Software,
MAPTECH® Terrain Navigator, Topo!™ Interactive Maps,
and DeLorme Topo USA® 2.0 and 3-D TopoQuads™
Roger Fryar, Project Leader
Sections
Introduction
Garmin GPS III Plus
Mapping Software
Selective Availability
Position Accuracy
DGPS Services
Equipment and Product Prices
Methods
Testing Equipment and Services
Results From Testing of GPS Equipment
Mapping Software Comparison
Discussion
Recommendations
References
Figures
1. Garmin GPS III Plus screen display using MapSource™ USA Topo downloadable software.
2. Digital map from USGS 7 1/2-minute quadrangle.
3. Area displayed using DeLorme Topo USA®.
4. Comparison of GPS positions. (Stars are GPS III PLUS positions.)
Tables
1. Garmin GPS III Plus versus cadastral survey-grade GPS equipment, and compass and tape closed traverse.
2. Comparison of digital mapping products with Topo™.