Scuba diving compass
Experienced and inexperienced divers can both become so engaged in their underwater activities that they lose their way. New divers who are accustomed to a guide leading the way may feel a bit lost for direction at first. A definite must on your list of equipment should be a scuba diving compass. Instead of trying to remember your route, you should use a compass to help you find your way through your designated path as well as the path back to your exit. There is a problem that you will discover when you shop for a scuba diving compass: there are many from which you can choose.
The XS Scuba Wrist Compass Complete compass features the wrist style compass. This compass is probably the most popular because you wear it on your wrist where it will stay secure and where you can easily read the console. The XS is made with high-power magnets that will deliver precise and accurate readings. You can also read this compass either by looking straight down into the face or from the gauges that display on the side.
For convenience, you can purchase an all-in-one system such as the Navigation Slate w/Mini-Retractor and Compass. You simply hook this equipment to the D-ring on your BCD and you are prepared to keep track of your direction and record any notes. The mini retractor allows you to let the equipment snap easily back in its starting position.
A compass gauges your direction. You don't have to spend a significant amount of money for one, although the more expensive brands offer more features. The WHISTLE/COMPASS/THERM by Innovative Scuba is probably the simplest scuba diving compass you will find. For only $5 you can have a compass, underwater whistle, and thermometer. You can easily add on a slate if you desire to do so. This compass may not last as long as the XS compass, but it should provide what you need for basic dives.