I have Map Create 6.3 and a Fishing Hot spots Elite card. I think the answer to your question is no but what you can do (and I have a lot to learn) is load Map Create in your computer. With it you can now create maps selecting the info you want (ie roads, cities, boundries, etc) and then load that onto a MMC or SD card. This can then be loaded into your GPS. You can also manage your waypoints with Map Create and if you have the Hot Spots card, that can be loaded into Map Create giving you more detail.
Waypoints created or loaded to Map Create can also be loaded on your Hot Spots card then into your GPS. If all you use your GPS for is fishing then I would say you don't need the Map Create program. But if you want to use it for driving, hunting, etc then Map Create is great for that unit.
As far as loading a Map Create program and then the Hot Spots card in the H20, I don't think it will work as I believe the card has to be in there while using that particulat program. I also have a unit with 2 card slots. I put the Hot Spots in one slot and a blank card for recording what the sonar sees. I've never tried puting a Hot Spot card and a card created from Map Create in it as I've never needed that.
A lot of rambling I know but I hope that help some. Hopefully some more people will jump in here as I'd love some new ideas.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va