Two weekend ago, on returning to my dock area we ran aground about 300 ft. from the entrance. Turns out it was almost exactly low tide. Having a lot of time, I went into the water and noted that the water came to my chin, about 4 ft. Other boats, all power boats, were coming and going without any trouble and some told me they drew 3 ft. 8 in. and another that he drew 4 ft. Finally, late at night, when the tide had risen enough to just float us, we were towed into the slip area still with some difficulty. Yesterday I the boat was floating at the slip (I know because I could pull it forward, back and sideways) and I measured the depth of water; it was 3 ft. 9 in. I also contacted Hunter but since the boat was manufactured in 1984, they did not have any record of the manufactured keel depth. If I have a shoal keel (3 ft. 3 in.) why would I run aground in 4 ft. of water? There is a lot of sea grass in the area and that may have caused the problem. The reason the power boats had no problem was that they do not have a keel and have a lot more power. Other than going below with some goggles, does what I say make sense? Do I have a shoal keel and got it caught in the sea grass?