What do you mean by updated? I think it’s been several years since any change was made to the rules that govern motor areas on basswood?
The Voyageur maps do show the boundaries with thick red lines. Map 4. You can use the map viewer on their website and I’m also including screenshots here. Additionally, do not cross the Canadian border with a motor or you’ll be in Quetico.
In the first image I use the NW tip of Lincoln island and the small islands north of Washington island as my visual queues:
In the second image showing the border at the edge of Jackfish bay, the site to the west is 1558. I use that as my visual queue.