Underwater Navigator

Knowledge Review - Part 1

Five benefits of learning to navigate underwater:

Estimate distance using kick cycles by swimming a known distance and counting the number of kick cycles used. Divide distance by kick cycles.

Estimate distance using elaspsed time by swimming a known distance and tracking the total number of seconds it took. Divide distance by seconds.

Four predive observations to assist with natural navigation:

Descend head up to aid navigation.

Six natural references that can help you navigate during a dive:

To maintain an accurate heading you should hold and swim with a compass so that the needle doesn’t lock and you are aligned with the lubber line.

Set a heading:

Set a reciprocal:

Hints for using a compass underwater:

Knowledge Review - Part 2

Estimate distance using cylinder pressure by noting your starting air pressure, swimming a known distance, then subtracting the current air pressure by the starting pressure and then dividing that by the distance.

Navigate a square/rectangle pattern by:

Navigate a triangle pattern by:

Navigate a U-pattern by:

Fix a dive site for relocation using permanent landmarks by:

Fix a dive site for relocation using a compass by:

Two electronic dives that can assist with underwater navigation:

Use a course plotter to track your location during a dive by:

Find the heading and distance back to the start point using a course plotter by moving wheel until the end of previous plot line touches the heavy grid line directly below the center. The number on the compass ring aligned with the compass heading arrow indicates heading.

Set a heading calculator to get the heading for a counterclockwise square/rectangle simply by setting the initial heading. The calculator will then have necessary headings.