First, in answer to your specific question, I don't know. have not tried the CMAP.
In general, the tip of the Hook changes quite a bit over time. Sandbars lengthen or shorten, shoals form where there was deeper water. Updated charts are prudent from a safety perspective. The (what you may see as relatively high) upgrade cost would be recoup'd by just one "incident" avoided.
Or, best of both worlds, get an updated paper chart- cheaper, up-to-date, and little likelihood of it crapping out like marine electronics do sometimes....
