Well done Bruce.
Sounds like a lot of people are a lot wiser as a result of you honesty.
Just to put a bit more of the fear of God into you. Were you aware of and how close did you come to Brook Ledges, Atherfield Ledges, the overfalls around St Catherines Point (probably not there with the wind as it was), the isolated rocks off Dunose, Bembridge Ledge and the (recently removed) submarine barrier between No Mans Land Fort and Seaview?
More advice.
Planning need only be for the area you propose to go. Familiarise yourself with any hazards, look for landmarks in the vacinity and remember their relationship.
For example, when you see you have gone inside a line from No Mans land Fort and Ryde Pier, you will know you may be about to go aground. You do not need to spend days reading up the whole area, just the bit that will affect you.