Yachting and Navigating

I enjoy flotilla sailing in the Mediterranean but admit to having only a rudimentary knowledge of navigation.
So this page exists merely to provide a link to yacht charter companies (see below), to the manufacturer of my Garmin GPS-II+ handheld navigator, and to the sort of post-hoc charts that can be generated with its help.  On land, I link my GPS to my Psion palmtop for coarse map tracking using a map program (Mapper-GB).
My mate and I used to go flotilla sailing with Sunsail but have found them to be rather inflexible so for several years past we have instead been with Setsail.
In 2001, however, we convinced ourselves to "push the boat out" and try the British Virgin Islands in the Caribbean with The Moorings. They offer a one week flotilla, extensible with an additional week of bareboating. We found that in the last two weeks of June, into July, there was an increased incidence of rain squalls. The track of the flotilla week is included in the post-hoc charts mentioned above.
I have found useful advice on yachting matters in Yachting Monthly magazine.