I've got this one, pretty happy with it. I see that they now have GPS built into their high end models.
https://www.cobra.com/products/mrhh350fltI'm curious where you will camp along the way. I've wanted to sail up Door County, but don't know about shoreline camping. I recently camp/cruised (in a Sunfish!) for 4 days in the Apostle Islands. And I've been planning an Isle Royale camp/cruise with the Hobie.
(Edit) I looked at a map of your route, Point Beach State Forest just north of Two Rivers might be somewhere you can camp. I don't think they have shoreline camping but you might be able to beach and walk in.
I got a Garmin Inreach Mini for satellite communications and emergency beacon in case of an emergency on Lake Superior.
Are you taking flares/personal strobes on your voyage?
(2nd edit) Matt, who has a youtube channel "Adventures in Reach" camp cruises his Sunfish and makes videos. I went with him through the Apostle Islands, and he sailed around Isle Royale (my inspiration!)! He's got some great advice in his videos.
https://www.youtube.com/c/adventuresinreach