Mapsource Garmin [best] Direct

Released in the early 2000s, MapSource served a deceptively simple yet powerful function: it allowed users to manage maps, waypoints, routes, and tracks between a computer and a Garmin GPS device. In an age before ubiquitous internet, MapSource acted as the command center for navigation. Users could purchase detailed topographic or city navigator maps on CDs or DVDs, load them into MapSource, and then selectively transfer grid squares of data to devices with painfully limited memory—often measured in megabytes rather than gigabytes. The software forced a discipline that modern users rarely consider: you had to be intentional about where you were going. You could not carry an entire country in your pocket; you had to curate your digital map library.