Declination / Rotate Map

Declination – Background Information

Magnetic meridians. Source: Wikipedia.

Does a compass point to the geographic North Pole? No. Does a compass point directly to the magnetic North Pole? Not necessarily.
The compass is always oriented in the direction of the local magnetic meridians and therefore usually shows neither exactly to the geographic nor straight to the magnetic North Pole. The Declination is defined as the angle between the direction of the magnetic meridians and the direction to the geographic North Pole at the observation site.
If magnetic north lies west of geographical north, the declination is called western and counts as negative; if magnetic north lies east of geographical north, the declination is called eastern and counts as positive.
An observer in middle and northern Europe sees the Arctic magnetic pole to the west of the geographical North Pole. At the same time, however, he notes that the local magnetic meridians are pointing in a direction just east of the geographical pole, so that the declination here is a few degrees east.

World Magnetic Model. Source: NOAA.

Declination varies both from place to place and with the passage of time. The reason for this are complex fluid motions in the outer core of the Earth which cause the magnetic field to change slowly with time. That’s why old maps have to be adjusted to the new declination time by time.
The declination in Switzerland is currently only around 2° and is therefore neglected in almost every map. 1° difference would mean 2.2m deviation for 100m. In the example below, you should miss the control by about 13m on the right (purple x)  when running straight with your compass ( 2.1° declination, 280m distance).

How can you adjust the Declination in OCAD?

In OCAD, there’s a new function called Rotate Map to Magnetic North.
This function considers the Magnetic declination and the Grid convergence of your current position and suggests by how much the map should be rotated. Learn more about this new function here.

In the Map Menu, there are two more functions where you could rotate your map. Do not edit the Angle in the function Set Scale and Coordinate System. Only change the angle there, if you start a new map and haven’t drawn any objects yet. The function Rotate Map is basically the same as Rotate Map to Magnetic North, but not that sophisticated.

Things to consider

Every time you rotate the map, the position accuracy of your objects is reduced a bit due to rounding differences. Therefore, we recommend not to adjust your map every year to the current declination, but maybe every fifth year.

A possible workflow would also be to rotate the map only before you print and export it. This way, you avoid rounding errors. The disadvantage is, that if you rotate the map at once with a big angle, non-rotated objects oriented to north could possible suddenly interact with rotated objects in a negative manner. Therefore, we do not recommend this workflow.

Remove Overshoots and Undershoots

Overshoots and Undershoots happen when your drawn line doesn’t connect exactly with the neighboring line it should intersect with. Mostly, the error only becomes visible with a large zoom level.
In OCAD, there is a function that removes Over- and Undershoots of selected lines. If you want to prevent Over- and Undershoots, enable the Snapping function.

Remove Overshoots and Undershoots

For an animation and more information, please see our Wiki.

 

Color Definitions for Orienteering Maps

The International Orienteering Federation IOF has updated the recommendations for Printing and Color Definitions according to modern practices.

OCAD implemented the new color specification in the latest OCAD 2018 Service Update. Download this Service Update from the OCAD Help menu.

You can read the Appendix to ISOM 2017, which explains the background of the update and the different printing techniques, here: ISOM 2017 Appendix 1 – CMYK Printing and Colour Definitions.

Copy and Export Course Scheme

In the Course Setting Module of OCAD, you can now either copy the Course Scheme to clipboard as Bitmap or export it in a new .ocd-File. If you prepare a map with all controls for a relay, add the Course Scheme to keep track of your courses.

 

To Copy the Course Scheme, simply click on the corresponding icon on the lower right corner.

To Export the Course Scheme, choose the corresponding command in the Export submenu of the Course Setting menu. Later you can import this file into your course setting project.