Best part of £600 for a GPSMAP 67i and £300 for Top Pro maps and I spend half my time trying to get the damn thing to stay connected to my Mac so I can install routes or plot out routes.
This is more of a general gripe, I don't know whether Garmin bother to read these forums, but it's really unacceptable.
I've now resorted to using the Android File Transfer and copying the GPX from OS Maps to the GPX folder on my device.