Do you need a compass for scuba diving?
While doing the first course, divers have too many concepts to learn and assimilate. In addition, they do their first dives with a guide and, therefore, they don’t need to use a compass. So, it is better that they focus on learning how to use the dive compass well in advanced courses.
Point the compass toward the object, rotate the bezel until the witness marks are over the magnetic needle and follow the lubber line.
Does a compass work underwater?
Any magnetic compass absolutely will work underwater. Several companies (e.g., PNI, OceanServer) build and sell electronic compass modules based on flux-gate technology specifically for underwater applications.
What is NDL diving?
The no decompression limit (NDL) is the maximum allowable dive time that you can remain at a specific depth and ascend directly to the surface without requiring staged decompression stops on the way up. Remember the higher the partial pressure of nitrogen (ppN2), the shorter the dive time (NDL).
How many ticks does a compass have?
Your compass will probably have eight bold tick marks between two adjacent cardinal points–between N and E, for example.
How do you tell which way is up underwater?
Remember to ascend as slowly as possible, especially if you not able to look at your dive computer or depth gauge. Another good way to know which way is up is to look at the water in your mask. Water will always go down, so go the opposite way of the water drops in your mask.
What are the three basic rules of scuba?
The three Basic Rules of Scuba stated in the proper order of importance are: Breathe continuously, ascend slowly and maintain control, and never dive alone or beyond your level of training.
What is the most efficient breathing pattern for scuba diving?
The only thing for certain is that the optimum breathing strategy when scuba diving is deep slow breathing. You need to inhale slowly and then also exhale slowly without holding your breath.