Art.
I too have the Navionics HotMaps Premium.
MSD/PREM E6 Vol 1.22
Mine is from 2007.
I pretty much use it for Navigation purposes only. I do use it to know about where shallower areas are and in somewhat handy last year up at Lakair. Couple errors I found - like markers the wrong color.
Thought about getting a newer version, but the recent additions would not help much in the areas I fish up that way. I have an old version of Map Create for Canada, that I made some maps from. Although this only shows shoreline contours - no depths and such. Again, primarily for navigation on unmapped waters - which the French River has not been mapped.
Not sure I helped ya much, but this is what I have and how I use it.
See you guys in a few months - coming in late Friday afternoon.