Diablo,
Run the marker poles in ST. Charles Bay. There will be a Stop sign when the poles end where it gets to shallow (less than 1') to run. Hang a hard right there about 100' BEFORE the sign. There will be a gap between two islands. There is a pole on the right marking a reef and one on the left on the way through. It is not very well marked. Stay to the far left through the cut. TAKE IT SLOW first and/or watch other go through. If you miss it, your stuck. It does get deeper (to 15') there in the channel between the islands. Take/get your GPS. The ramp can also be tricky in a strong tide/current. (The locals sit and watch people crunch boats) Hit the boat trailer faster than most to maintaine control in the side current. Going slow to the trailer will get you in trouble.
Be safe.
Fish Inspector
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I'm a humble fisherman in the service of our Lord.
Started fishin at 5 years old and can't stop.
I've owned a boat every day from age 16.
I fish for every type of fish in every different way.
Kevin