ATJ
Contributor
This is pretty much true with any dive computer on the market.I believe someone indicated that the dive logging was proprietary, and 'in the cloud' - their cloud. If you like the idea of logging your dives via computer, so you get the nice graphs, max. depth and average depth logged automatically, etc...then consider that over the years you may vary in what brand of computer you use.
The reason you can load the data from the computers you have into MacDive is because MacDive wrote code to import the data.
By the way: DeepBlu Cosmiq work-around - MacDive Forums