In the Advanced Navigation Special Course, use compass navigation on quadrangular or triangular lines.

Learn how to use a higher level compass.

In addition, you can learn how to read the compass's azimuth, and even the slightly complicated roots of the diving spot can make a simple and topographic map of the sea floor.

Make underwater topographic maps with underwater photos and more and leave happy memories.

Of course, the location of the treasure is marked with ＄! ?