I agree that a small Danforth with 10- 15 ft of chain would be good for a small inflatable. If diving solo, or even in teams, obviously always dive up current for the entire dive and work your compass so when surfacing you can easily coast back to the boat. Also, consider clipping a strobe about 10ft off the bottom to your anchor line to help you find your way home. Lastly. if diving solo, make sure to leave a 20 to 50ft tag line off the stern so you have options if you miss the boat on the return