You can buy the NavPlanner which works with most of their charts except for the Classic Charts and HotMaps Classic Lake Maps. It will cost you a little over $100.00.
I sent you a pm with more info on the NavPlanner.
Another option is to buy a 12v power cable (CA-8) for your 522 and use it to do your scouting. I have a car jump starter with a DC power source and use it all the time to run my units in the house. Power cord is ~$40.00.
What is the difference between NavPlanner and Hotmaps Explorer??? I’ve been on the Nav site, but didn’t know you needed a special program to view the card.
Is there anywhere you can download a Demo of either the Navionics program of the Lakemaster program? I think it would be great to be able to do a little digital scouting of new waters from my computer, but $100 seems plenty expensive. I guess I’d like a ‘try’ it before I’d consider purchasing something like that.