Bushy,
Here it is today.
Ed

No...It looks different now. I left boat trails all over the place. I know because when I left by air you could see where I went in and corkscrewing around all over the place and where I went out. Your boat? It must have been low tide when I was in there. It do look familiar...

Ha, ha, ha... no, this is it. I will explain.

Look behind the boat in the foreground you will see a smaller boat to the left, it is a jet boat... draws about 4-6 inches. The real light colored water is about 12 inches deep, the dark edge behind is short grass on the bottom, in the shallows. Looks just like deep water and that grass fools a lot of folks. I did that once myself years ago, went around the "Island" and wham, was in the grass, like a floating ditch witch.

When you get into the grass you will do just as you describe. Grass is dark about 4 inches tall and bottom is white sand. Prop going through the grass leaves a white trail the width of the prop.

Nope, photo was from my boat, in about 8 feet of water. I draw 38 inches with this boat so I do my best to stay out of the shallow end of the pool. Making marks in the grass could get real expensive, real fast...
Ed

The 26" diameter 26" pitch 4 blade bronze propeller on my 24 ft tow boat (used for towing 36 ft ocean oil skimmers) was real shinny when she came out of the water. Yup...Moved a lot of sand with it that day...