Hi,

Let's see what's Garmin says about Topo France v3 light on french Garmin site.

Here are answers to two questions :

1- During the download of a zone, may I define a different location other than internal memory of my GPS, as for example a microSD card ?
No, download platform only authorizes location in internal memory recording of light zones .

2- Is it possible to merge two light zones to allow continuous navigation between these two zones?
No, it will be necessary you to tip over from a display to the other one to pursue the navigation.