In short, no to either. Garmin maps are locked and require a key, so can’t be transferred between devices, so a map from one device can’t be transferred to another device, even with the JavaWa tools.
Garmin maps to all intents and purposes can’t be copied from a device to a computer. The device uses a .img file and the computer uses a .map or .mapi file. You could do it if you read the map into a map compiler, then unlocked it, then compiled a new map and created a .mapi file, but it’s non trivial.
Of course using Basecamp you can view a map on the computer that exists on the device.
Get your tight mate to buy the maps, Garmin are doing 25% off just now.
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