The Channel Islands?

[Zaleukos]

Nice idea, it occurs to me that neither chain is present in M2TW. Didn't Columbus actually sail from the Canaries?

He did. Such islands would also be a lot more important if there was a limit to how far ships could go without resupplying (either from a friendly port or by simply stopping to chop down a few trees and refill sweet water supplies).

Other priority islands would be the Carribean sugar colonies, they were immensely valuable and it is rather telling that France rather gave up Canada after the seven years war than lose Martinique and Guadeloupe... The Indonesian islands (which are a good deal bigger than anything mentioned in the thread, and extremely populous) should also be in as they constituted most of the Dutch empire (provided the map covers that area, does it?).

Rockall could be supplemented with Hans Island, a gem that still stirs up emotions between the commonwealth and the foul Danes;)