GPS receivers accuracy comparison. There are several types of GPS receivers in use. the GPS receivers accuracy depend on its grade.

Survey grade gps receivers are the most accurate and the most expensive. Typically these receivers have sub-centimeter accuracy and cost in the tens of thousands of US dollars. Mapping grade gps receivers typically can produce sub-meter accuracy and cost between US$1,000 and US$5,000 and are designed for high-end cartographic activity. Recreational grade GPS units are designed for use when hunting, hiking, boating etc. Of the three types described, recreational receivers are particularly well suited for use in MEASURE projects. The cost of the unit is typically less than US$200 and positions recorded are accurate to within 15 meters or less.

For most projects 10-15 meter accuracy is acceptable, and this level of accuracy can be achieved with nearly all recreational grade receivers. Some receivers provide the ability to improve accuracy through the use of point averaging. Multiple readings are collected at one location over a specified period of time, then the mathematical average of the points is derived. This minimizes the effect of the errors present in the coordinates.

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