Which frequency is used for mapping grade GPS signals?

The frequency used for mapping grade GPS signals is L1. This frequency operates at 1575.42 MHz and is the primary signal used for civilian GPS applications, making it essential for basic navigational needs and mapping services. The L1 frequency carries the Coarse/Acquisition (C/A) code, which enables civilian users to access GPS location data. It stands out due to its widespread use in consumer GPS devices and its ability to provide static and real-time positioning information, which are crucial for mapping projects.

While other frequencies, such as L2, L3, and L4, are used for different purposes (like military applications, ionospheric corrections, and experimental uses), they are not primarily intended for the same level of civilian mapping applications as the L1 frequency. Therefore, L1 is the most appropriate choice for mapping grade GPS signals.