Depending on your source:

Among the myriad of map releases, holds a specific place in the timeline of GPS history. It represents a pivot point in technology—a blend of the legacy "MapSource" PC software era and the rising dominance of the newer "BaseCamp" platform, pre-dating the widespread adoption of "lifetime maps."

is the legacy Garmin software application that preceded BaseCamp. For users in the early 2010s, MapSource was the desktop gateway to manage waypoints, routes, and map tiles before transferring them to a device.

: Includes millions of POIs, such as hotels, restaurants, gas stations, and attractions.