: Provides detailed UK and international maps with contour lines.

These are highly recommended as they are often more up-to-date than official legacy Garmin maps.

: Best for creating custom "extracts" of specific cities or regions, which keeps file sizes small.

: A microSD card (up to 32GB, formatted to FAT32 ) is recommended.

The Garmin Edge 800 remains a popular legacy cycling computer primarily due to its reliability and support for custom map files via its microSD card slot. Because the internal memory (roughly 100MB) is too small for modern map sets, you will almost certainly need a . 1. Requirements for Map Installation

: Use a mini-USB cable to connect the Edge 800 to your PC or Mac. Format : The Edge 800 reads map files in the .img format. 2. Sources for Map Downloads

: Highly popular for cyclists in Europe and North America, offering optimized cycling paths and points of interest.