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Magnetic Variation

Select Magnetic Variation from the Utilities menu to open this dialog box.

test00000111.gif

If you wish that the headings are indicated by the software in geographical mode, click the button Geographic heading, if you wish that the headings are indicated as compass headings, click the Compass heading button.

The compass heading is that which is indicated on the onboard compass. The geographical headings refer to the north of the marine chart.

Using the keys + and -, enter the present declination on your navigation region, do not forget to fix the direction (East or West).

Then enter your magnetic deviation as above for the consumption curve.

The deviation is the error of your onboard compass, due to the presence of magnetic masses onboard, it depends on the heading of your ship.

Choose the different deviation values for each ship heading. Take care to use the correct direction for the curve (East or West).

Caution! If you have chosen Compass heading mode the software displays all the headings taking into account the variation (declination and deviation). However, deviation is not applied when the bearing lines are plotted using the Bearing tool test00000112.gif (see chapter Erreur! Source du renvoi introuvable.). In effect these are generally taken using a bearing compass which is not affected by the deviation (only the correction due to declination is brought to bearing values).