This Trimble HandHeld is one of the affordable yet giving good accuracy of GPS. However, when you developed your own program to gather GPS, do not forget to set the minimum satellite into 4. If not, this HHU can work with only 2 satellite available. With 2 satellite, you can have significant error.
Before buying this kind of HHU, make sure you get the latest product with GPS card that can be used for post processed data. With post processed, you can even improve the accuracy of the GPS position into 0.3 - 2 meters.
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