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roaming | That's a pretty big question, and has been answered in one form or another many times in this forum...
With a guidance-quality receiver, you should be able to expect 6"-10" pass-to-pass accuracy, and sub-meter static accuracy. With a handheld receiver (think Garmin, Magellan, etc.), you're probably looking at more like 10' static accuracy, due to the GPS engine and the quality of the antenna.
WAAS is generally accepted as appropriate for broadacre guidance applications including spraying, tillage, fertilizing, etc. It is not considered reliably accurate enough for row-crop planting, although there are people who say they use it for this and like it.
In a very small nutshell:
The good: free, widely available, accurate enough for many applications, allows low-cost entry into various precision farming applications
The bad: susceptible to GPS drift (as are all non-RTK signals), not accurate enough for some applications
Edited by torn 4/7/2009 21:26
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WAAS
