[Gerry Zagorski]

Do you have a tablet?? If so Navionics app is free and it's awesome. Not sure how it is on a pc but you might want to give it a shot. The tablet/phone app will do everything on your list and you can use it out on the water as a back up for your on board chart plotter as long as the tablet or phone has a GPS built in.

Some of the newer navionics based map boat chart plotters now come with wifi. You can then take what you've done on the phone or tablet and synch it with your boat plotter via wifi.