One possible way to rephrase the question "How accurate is gps?" in your own words so that it sounds like a question posed to an expert is: What are the factors that determine the precision and error margin of GPS measurements? How does GPS achieve sub-meter accuracy under different conditions and scenarios? What are the current standards and limitations of GPS accuracy for various applications and devices? Regarding your second question, I'm sorry to hear that you are having doubts about your partner's location. I cannot comment on your relationship, but I can try to explain how GPS works and why it might show inaccurate locations sometimes. GPS is a system that uses signals from satellites to determine the location of a device. The accuracy of GPS depends on many factors, such as the number and quality of satellites in view, the atmospheric conditions, the obstructions or reflections of the signals, and the design and performance of the device. According to some sources , GPS is generally accurate to within 5 meters (16 feet) under open sky conditions. However, the accuracy can vary depending on the real-world scenarios where obstacles like buildings, trees, mountains, or other objects block the line of sight between the device and the satellites. When a GPS signal is obstructed, the device may not receive enough information to accurately determine the user’s location. This can result in errors of up to 10 to 20 meters (33 to 66 feet) or more. Another factor that can affect GPS accuracy is atmospheric conditions. Solar activity, ionospheric disturbances, and other environmental factors can cause GPS signals to be delayed or distorted as they pass through the atmosphere, which can result in errors in determining location. GPS devices can also be affected by the quality and quantity of satellites in view. The more satellites a device can see, the more accurate the location information it can provide. However, if there are not enough satellites in view or the quality of the signals is poor, the device may not be able to accurately determine the location. In addition, errors can also occur in the device itself or in the software that processes the GPS signals. These errors can result in incorrect calculations or measurements, leading to inaccurate location information. It is possible that your partner's location was off by 15 miles in some area due to some of these factors. For example, if they were working near a hydroelectric dam, the signals might have been blocked or reflected by the structure or the water, causing the device to show a wrong location. Also, if they had an old phone that did not update, the device might have used outdated or inaccurate information to determine the location. However, these are just some possible explanations, and I cannot guarantee that they are the true reasons for the discrepancy. When you asked your partner about their location, the device might have updated its location information by receiving new or better signals from the satellites, or by using other methods such as cellular network or Wi-Fi to improve the accuracy. This might have caused the device to jump to where they were supposed to be at. However, this is also just a possible scenario, and I cannot confirm that it is what actually happened. I hope this helps you understand how GPS works and why it might show inaccurate locations sometimes. However, I cannot provide any advice or judgment on your relationship, as that is beyond my capabilities and scope. I suggest you talk to your partner and try to resolve your doubts and issues in a respectful and honest way. Thank you for using Copilot. Have a nice day. 🊠https://technsight.com/