Kerry wrote on Jan 24^th, 2015 at 11:01pm:

Yeah, I got mine just before last year's trip.  As Marten says, a lot of differences and having the new map did save me a lot of headaches (and backaches.)

I concur with Dr. Kerry  ;)
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The new map was quite key in solving a few navigational puzzles in WCP last summer. While 95% of the time I used topos I did become perplexed and stuck 2 or 3 times until I pulled out the park map and the overall perspective and additional info provided.

For example when leaving Mexican Hat the topo shows clear sailing right through to the next lake but the lake seems to end......hmmmm, wheres the portage? Pull out the park map and the AHA (!) moment happens rather quickly.........differences in color and the words shallow provide the clues that the wall of reeds and "obstruction" (beaver dam) further inside must be assaulted to gain the next lake.

Important map to have........in a pinch I believe it might suffice just fine to be the only map you would need.