# Compass Calibration

## Compass Calibration

<figure><img src="https://3611896438-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Mf7j4nUAIpHY72_rYOl-1703796690%2Fuploads%2FVOgdjW1v0qJl2QqPXs1Q%2Fimage.png?alt=media&#x26;token=3d53f433-715f-4045-9c32-65d5b3a589b2" alt=""><figcaption></figcaption></figure>

{% hint style="success" %}
A magnetic compass is naturally sensitive to external influences. Interference can be caused by:

* Magnetic objects such as screwdrivers, eyeglass cases, AirPods cases, or magnets in clothing
* Electronic devices, including mobile phones
* Nearby infrastructure such as harbors, bridges, locks, tunnels, high-voltage lines, and underground cables

These factors can result in inaccurate heading readings.

*Tip: For a stable and reliable heading display—especially in areas with strong magnetic interference—we recommend using the GPS ground course whenever possible.*
{% endhint %}

### Magnetic heading

This is the direction the bow of the boat is pointing, relative to **magnetic north**, as measured by the internal compass in the ControlHead.

* 0° = North
* 90° = East
* 180° = South
* 270° = West

### Pitch

Pitch measures the tilt of the bow up or down:

* Positive pitch = bow up
* Negative pitch = bow down
* When the boat is level, pitch should be close to **0°**

### Roll

Roll measures the tilt from side to side:

* Positive roll = leaning to starboard
* Negative roll = leaning to port
* Should also be close to **0°** when the boat is level

{% hint style="info" %}
Both pitch and roll values are provided by the inertial sensors (IMU) inside the ControlHead.
{% endhint %}

### Alignment

Press the ![](https://3611896438-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Mf7j4nUAIpHY72_rYOl-1703796690%2Fuploads%2Ff095dPOEZq8yNbtoJZDh%2Fimage.png?alt=media\&token=19865820-e2a0-45ed-b8c5-6270a261f82c)button only when the boat is level and stationary in the harbour to align the internal inertial sensors.

{% hint style="warning" %}
Make sure the ControlHead is permanently mounted before alignment. After pressing the button, Pitch and Roll should both be close to zero.
{% endhint %}

### Magnetic Heading Offset

If the ControlHead is mounted facing straight forward, leave the offset at **0°**.

* If mounted sideways:
  * **Starboard side:** use **–90°**
  * **Port side:** use **90°**

### **Compass Lock Calibration**

Best performed on open water, away from magnetic interference.

* Sail gentle laps both port and starboard.
* When the heading is stable, enable **Compass Lock Calibration**.

{% hint style="info" %}
If you notice inaccurate heading under heeling conditions, consider temporarily unlock — the compass will then learn under those conditions.
{% endhint %}

## Calibration Plot

{% hint style="danger" %}
For experts only
{% endhint %}

<figure><img src="https://3611896438-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Mf7j4nUAIpHY72_rYOl-1703796690%2Fuploads%2FaYOvLAbIPfrilWTUPCrF%2Fimage.png?alt=media&#x26;token=67092a59-e38b-45c6-bd75-291915d1b956" alt=""><figcaption></figcaption></figure>

On this page you can view a visual representation of the calibration data. You can also configure the lock for both the compass and the accelerometer here.

### **Calibration Locks**

#### **Compass Lock Calibration**

It is best to perform this calibration on open water, away from magnetic interference.

* Sail a few gentle loops to both port and starboard.
* When the heading remains stable, you can enable **Compass Lock Calibration**.

#### **Accelerometer Lock Calibration**

{% hint style="danger" %}
This setting should remain locked during normal operation.
{% endhint %}

Accelerometer calibration is **not required** under regular conditions. **It is performed by us before delivery.**

* The process involves placing the ControlHead briefly on each of its six sides.
* This requires the unit to be removed from its installation.

### **Calibration Type**

Select whether you want to calibrate the accelerometer or the compass. Calibration only takes place when the corresponding lock is disabled.

### **Calibration Parameters**

This section shows the current calibration values for both the accelerometer and the compass. When a new calibration is applied, the “age” will be reset.