GeoLink Configuration

1 GeoLink Support

GeoLink is supported from firmware version 2.5. In order to utilize all the functions it is necessary to enable the support in the Spirit Settings - General tab.

2 Compass Calibration

All GeoLink modules were fully tested and calibrated. The only thing pilot might need is to re-calibrate Compass. Compass is crucial for determining heading of the model for a proper navigation through space. Compass is sensing Earth's magnetic field (Geomagnetic field) and in this way it can determine heading at any time. Unfortunately Geomagnetic field is different everywhere. Thus if you live outside Czech Republic country where module was calibrated initially, it is recommended to perform new calibration. [TODO: need to perform testing with a pilots]

2.1 How to check

To verify that GeoLink is calibrated correctly for your area, please launch the Spirit Settings and open GeoLink settings window. At Info tab you can see current Heading value.

Please place the model or just GeoLink to the North as close as you can, so that flight direction of the model is front of the arrow. ideally compare to an analogue compass.

When heading to North, you should see approximately 90 +/- 4°. Measured value should not be far from this.

We recommend to not use a smart devices for compass heading comparison. These are usually not calibrated at all nor allow the calibration. An analogue compass is the best for comparison.

2.2 Odd behavior

If Compass calibration is wrong you will notice that features such as Geo-fence, Return to Home, Position Hold are not working precisely. For example when Return to Home is engaged and model reached programmed Home position, the model could move in a circle manner around that spot, instead of stable hovering. The bigger is circle, the bigger is Compass heading error. If you can observe this behavior always, then it is clear sign that you need to re-calibrate the Compass.

2.3 Calibration process

In order to perform the calibration it is necessary to enter Spirit Settings/GeoLink/Module and click the Calibration request button. After confirmation you will have to disconnect power from the module.

1. When powering up the model with GeoLink you will immediately notice 3 series of rapid LED flashing.
2. The Status LED will be indicating progress of the calibration. Start moving with the model in all possible directions and angles to mimic a sphere. Any LED flash will indicate that a new calibration data were acquired.
3. Rotate with the module as long until you will see periodic LED flashing. At this point the calibration is finished. After following re-power the module is ready for operation.
   

For 600+ class helicopters we recommend to perform calibration while GeoLink is not mounted. In that way it can be more comfortable and easier.

Calibration will not finish until it is fully done. If power is turned off while calibration is not finished, the calibration process will start from the beginning on next power up.