Final Answer:
Error sources for GPS usage include atmospheric interference, signal reflection, satellite clock inaccuracies, and geometric dilution of precision.
Step-by-step explanation:
Several factors contribute to errors in GPS accuracy. Atmospheric interference occurs when GPS signals pass through the Earth's atmosphere, causing signal delays. Signal reflection can lead to the reception of multiple signals, impacting accuracy. Satellite clock inaccuracies are another source, as small discrepancies in satellite clock timing can affect position calculations. Geometric dilution of precision (GDOP) is a measure of satellite geometry affecting accuracy; poor geometry increases errors. Other factors include multipath interference, where signals bounce off surfaces, and receiver errors. Understanding and mitigating these error sources are essential in enhancing the precision and reliability of GPS applications.