It is lat-long (but not the normal degrees minutes and seconds) but (I believe) it may be the "DD" (Decimal Degrees") system using "World Geodetic System 84" It is one of the format options on my hiking GPS system - if it is, it is not widely used in the UK. A quick AI search : Here are some key points about Decimal Degrees: Format: DD is a decimal representation of latitude and longitude, where each degree is expressed as a decimal fraction. For example, a location might be represented as 37.5665°N 123.4567°W. Usage: DD is commonly used in GPS devices, GIS software, and mapping applications. It allows for easy conversion between different coordinate formats and provides a consistent way to represent locations on a map. Precision: The precision of DD coordinates can vary based on the number of decimal places used. For example, four decimal places are usually sufficient for most locations, while five or six decimal places may be needed for more precise measurements. Conversion: DD can be converted to other formats like DMS (Degrees, Minutes, Seconds) and DDM (Degrees, Decimal Minutes). This conversion is essential for compatibility with various mapping and navigation systems.
