All data seems to transfer from the device to BaseCamp.
However I can't find Max Speed in BaseCamp.
In the Trip Computer of the Garmin Montana 650, there is a field for Max Speed.
How do I find Max Speed in BaseCamp?
Update 6/22/2014:
I found Max Speed in BaseCamp under "Current Track".
When I did my rowing exercise, the Garmin Montana 650 Trip Computer displayed Max Speed 5.9 mph.
The maximum speed displayed in BaseCamp was 7.
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I conclude that BaseCamp is unreliable for Max Speed.
If I could ever row my Thames Rowing Skiff at 7 mph, I need to enter Olympic Rowing!