If you run your boat aground there are two things that you should do immediately. First you need to make sure that all of the passengers and yourself are safe. Afterwards, you’ll want to check on the condition of the boat, mainly leaks or any other damage that could render the boat unsafe. If it’s a soft grounding you can usually free the boat yourself and get by without much damage if any. In a hard grounding make sure that you stay with your boat, make sure everyone has their safety jackets on, and then contact help. In the meanwhile, make sure that you do what you can to stop the leakage. If your boat is sinking and/or lives are at risk you can risk the Coast Guard by utilizing Channel 16.The key is to not panic and assess your situation as no matter how minor the situation panic will not help any grounding situation.
If your boat runs aground, you first have to assess the situation. Don't try and shift into reverse because you can suck up mud. You would want to check for hull damage. If there is damage, contact the Coast Guard. If there is none, you can wait for the tide to come up or you can throw an anchor in the direction you would like to go. If there is another boat available, they can pull you in the direction you would like to go. You can read more at http://boatsafe.com/nauticalknowhow/aground.htm