Re: C-Map Max vs. Navionics Platinum+
This version of Platinum likely covers the area that you need (plus it has coverage of Puget Sound):
Navionics 913P Platinum Plus Vancouver Island
Select Card Type: SD - Micro SD
Enter Chartplotter Model:: e7d
I bought it for $264 shipped from Star Marine Depot. Since it has better information (tides/currents, aerial photos, more detail) for Puget Sound than the silver charts that came with my GPS it was a worthwhile upgrade.
I just got back from a month cruise, including 3 weeks in BC. The charts were great.
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior