By repeatedly short pressing the middle button brings up the compass. First calibrate the compass, for more information see Calibrating compass.
The information on the display depends on which mode you are in.
In Air / Nitrox mode, you will see the following information in compass view:
In the switch window, you see the heading in numeric format.
In the Compass menu you can turn the bearing on or off, calibrate the compass, and set declination.
When you first start using Suunto D5, and after each charging, the compass needs to be calibrated and it is required to do so to activate it. Suunto D5 displays the calibration icon when you enter the compass view.
During the calibration process, the compass adjusts itself to the surrounding magnetic field.
Because of changes in the surrounding magnetic field, it is recommended to re-calibrate the compass before each dive.
To manually start calibration:
Repeat the rotation as long as the compass calibration is successful.
If the calibration fails several times in a row, you may be in an area with strong sources of magnetism, such as large metal objects. Move to another location and try to calibrate the compass again.
You should always adjust your compass declination for the area where you are diving to get accurate heading readings. Check the local declination from a trusted source and set the value in Suunto D5.
To set declination:
A bearing is the angle between north and your target. In simple terms, it is the direction you want to travel. Your heading, on the other hand, is your actual direction of travel.
You can set a bearing lock to help you orientate yourself underwater and ensure you maintain your direction of travel. For example, you can set a bearing lock for the direction to the reef before leaving the boat.
You can reset the bearing lock at any time, but you can only clear a bearing lock while at the surface.
To lock the bearing:
Keep the lower button pressed until you see the Bearing locked notification.
After you locked the bearing, you can see yellow bars to indicate the angle where you locked the bearing:
When the bearing is at 0°, no arrows are shown beside the value, as above. When the bearing is at 180°, two yellow arrows are shown beside the value:
One yellow arrow indicates the direction you need to turn:
If you want to set a new bearing lock, just repeat the same procedure above. Each bearing lock is recorded in your dive log with a time stamp.
To clear the bearing lock from your compass view, you need to return to the surface.
To clear a bearing lock: