Suunto EON Core includes a tilt-compensated digital compass, available as a main view.
When you first start using Suunto EON Core, the compass needs to be calibrated. Suunto EON Core displays the calibration icon when you enter the compass view. Calibrate the compass by slowly rotating the unit in your hand in large figure-8 loops.
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:
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 EON Core.
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 set a bearing lock:
Once you have a bearing locked, the lock position is indicated on the compass rose, as shown below.
Below your heading (large number in center of compass), you also see the relative difference between your bearing and your heading. So, for instance, when you want to travel in the exact direction of your bearing, the lower number should be 0°.
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: