Sas
Contributor
When I went from needing just basic dive insurance to needing professional coverage, I just paid the difference between the two levels offered through DAN. It was really quite easy and they sent me out my new policy and card straightaway. They also send a copy of your new professional level coverage to your agency (be it PADI, SSI etc). This was through DAN Europe but I'm assuming it would be the same for all DAN bodies...
Safe diving.
You can't do this with DAN Asia Pacific. Once you get a policy you cannot update it for the year.