On its own, the compass is useful for conducting reciprocal routes and geometric courses. However, combing compass use with natural navigation techniques opens up myriad of navigation options, and with practice, will become second nature.
When you use your compass in conjunction with natural navigation techniques, you will be able to return to your starting point with more certainty than by the use of one or the other alone. A typical example of this is when you are going to dive a notable dive site, like a wreck or reef that is out of sight of your entry location or anchorage. You will need to know the heading of the location before the descent.
Once you have descended and established neutral buoyancy, swim toward the location following your heading. Upon reaching your location, note on your slate the reciprocal heading you need to follow to return to your entry point, the depth, and a description of the natural landmarks present at that point. Also note of any unique characteristics at the location. While exploring the site, use natural navigation techniques. Notes on your slate as needed so that you can return to the starting point you noted. Once there, set your reciprocal heading on your compass and return to the entry point.
The compass and natural navigation can also be used together on the surface. This is particularly useful when diving from shore. Many times, the location you want to dive will be some distance from the shore. In these cases, it is recommended to save your gas for the dive, and swim on the surface to the descent point above the site. This will allow you to save your gas and maximize your dive time at the site.
Typically, when diving from the shore, or without the support of a dive boat, you will need to place a dive flag in the location that you will be diving. It’s easier to swim on the surface with your dive flag in tow, than to try to take it with you while under water. It’s important to research local laws regarding the use of dive flags before you go diving. Take a heading from the shore towards the dive site before you enter the water. Relax and take your time on the swim out. After placing your buoy, or dive flag, take a reciprocal heading towards the location from which you began, and note any natural landmarks. Now, enjoy the dive!
When using a compass in combination with natural navigation, it is important to trust the information it provides you. It is easy to get confused under water, and your gut instinct regarding direction may not always be accurate. Learn to use your tools and trust them. If you use them correctly, they will not fail you.