Check the Navionics web site to see if there is still a difference in the HD lake coverage for the lakes that you will fish Honda. There was a difference between the Premium and Platinum cards at one time but there might not be now.
I know that LakeMaster has been releasing new updates for many of their mapping cards and will continue to do so as they complete them. So I would check their web site monthly to stay up to date with the new changes that they are making (I think that they have a newsletter that you can sign up for).