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Bullseye


MasterZelgadis

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I have set a specific point in my mission, called LZ. In the editor I used the measuring tool to get the bullseye reference: 19° 187502 ft, which should be 30,8 nautical miles or 35,5 miles.

But in the mission, when I hook the point (bulls -> hook) I get 13° for 31.

Okay, the distance first, cause it should be easier: seems to be 30,8 nautical miles rounded up to 31, maybe some inaccuracy of the measuring. Check.

But the heading is 6° off. Why is that so? Compass error?

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I've posted the answer to this question several times before, but finding those posts can be tough, so you are forgiven for not finding them :)

 

The DCS map is flat, but it has a spherical coordinate system projected onto it (Lat/Lon).

 

Some game code (the ME, and last I checked, radio calls) use the map x-axis as the north direction, while avionics code uses a line of constant longitude as the north direction. It is probably best to consider this line of constant longitude the "true" north/south direction, as in the real world, it is. In the following discussion then, "true north" refers to this line of constant longitude in the direction of increasing latitude.

 

So due to the projection used to map latitude/longitude onto the flatworld DCS map, the x axis only perfectly aligns with true north at the map's central meridian, 33 degrees longitude. If you are off of that central meridian, then "true" north is different than the x-axis. The further you get from 33 degrees longitude, the larger the difference exists between true north and the x-axis. In the areas where we typically fly missions, the x-axis is typically 3-7 degrees to the east of true north.

 

It would probably be best if, for all displays of direction, true north was used, but the problem is relatively minor overall.


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