GPS after selective availability: How accurate is accurate enough?

Abstract

Global positioning systems (GPS) without differential correction may now be accurate enough for many forestry applications. We present accuracy estimates for point locations and a method of stating area accuracy so that potential GPS users can decide whether the accuracy is sufficient. The results show that GPS without differential correction is more accurate than traditional method of location and area calculation, short of actual surveying. Compass-and-pace is less accurate than GPS, and lines and points at customary map scales are as wide as typical GPS errors. If differential correction is not necessary, practitioners can use the inexpensive, light, and easily operated consumer-grade receivers and simple software.