Yes you have the correction location. I'd not noticed the chart calls it the East Basin

I entered the channel at R N "4" and proceeded on a mean course of 262 M

The conflict occurred on the north side of the channel between R N "10" and R N "12"

thanks for the input on this question

So it is what I originally identified as the East Basin - the East Basin of North Harbor Island. That was the only fairway I could see on the satellite photo that resembled your diagram.

We are in Sunroad Marina on the Northest end of Harbor Island. The channel in question leads in from the anchorage in front of the USCG base on Harbor Drive.

I've enjoyed your post about the conflict in San Diego. Which Marina are you talking about? I'm guessing from your diagram it was the East Basin.