No idea if this is of any help, but;
I went through there a year ago. There was only a red at the end. It was good
water to the red and at least 20'
depth for about 100' before it deepened again.
According to the Not to Mat No:23, (thanks to BillGood) there are 4 lighted beacons. I guess you'll see when you get there!!
Also we were surrounded by pod after pod of whales that arvo around Cape Moreton.