@colin-hodgkinson You're probably referring to the map overlays, as there have only ever been 3 different map options.

The overlays are in the top right corner of the map display:

Screenshot 2022-04-05 at 18.55.29.png

The difference is that the map option (OpenStreetMap, TomTom or Garmin) determines which map is used to actually calculate the route, while the map overlays determine what the map looks like on screen. Several overlays also provide additional information.

@Doug-Robinson Each map calculates the route in its own way, and with its own errors. As example, one map could take into account a roadblock while another doesn't.

The same for GPS deives that use different maps and calculation algoritms. Hence it is normal that calculating a route with different maps gives different results.

As a golden rule: always calculate the routewith the same ap that your device is using: TomTom or HERE for Garmin.

When riding in a group with different devices, the mara routeplanner allows to compare routes so you can add/move waypoints until it is exactly the same for both device families