hi ChatGPT, please i used smartphones Xiaomi, making pictures with camera, photos pics exif has coordinates info, but coordinates are not exact, may be 20m tolerance. As far as i know, in any smartphone here is GPS detector. Are there existing smartphones with more precise GPS detection? 5m tolerance, 1m tolerance?
ChatGPT

Smartphones generally use a combination of GPS (Global Positioning System) and other positioning technologies like GLONASS, Galileo, or BeiDou to determine your location. The accuracy of your smartphone's GPS can be influenced by various factors, including the quality of the GPS receiver, signal interference, and the number of visible satellites. Achieving 5m or 1m tolerance with a smartphone GPS can be challenging, as these devices are primarily designed for general navigation and location services, not for survey-grade accuracy.

However, some smartphones may offer improved GPS accuracy compared to others due to better hardware and software optimization. These improvements might not always result in a consistent sub-5m or sub-1m accuracy, but they can help in certain conditions. For example:

High-End Models: High-end smartphones may have more advanced GPS receivers and antennas, which can provide better accuracy than budget devices.

Dual-Frequency GPS: Some newer smartphones support dual-frequency GPS, which can improve accuracy by reducing errors caused by ionospheric disturbances. Dual-frequency GPS can provide more precise positions in the 1-3 meter range.

Differential GPS (DGPS): Some apps or external accessories can provide differential GPS corrections to improve accuracy, but they often require additional hardware and may still not guarantee sub-5m or sub-1m accuracy.

Assisted-GPS (A-GPS): A-GPS combines GPS data with data from cell towers and Wi-Fi networks to improve initial GPS satellite acquisition. This can help get a quicker and more accurate fix on your location, but it may not consistently achieve sub-5m or sub-1m accuracy.

If you require very precise GPS coordinates with tolerances of 5m or 1m, you would typically need specialized equipment like survey-grade GPS receivers or use external GPS devices designed for such applications. These devices often use high-precision surveying techniques and can be quite expensive. They are used in fields such as surveying, geodesy, agriculture, and construction where precise location information is critical.

For everyday smartphone use, the typical accuracy should be sufficient for most purposes, such as navigation and geotagging photos. If you need more precise data, you'll need to explore specialized solutions and devices