GPS, MechJeb, Stock Coodinate system all disagreeing

[lextacy]

The picture says it all.

As you can see Figaro and Mechjeb are displaying N and W , but the map view is saying N and E . What gives?

[maltesh]

There are several issues with the code that displays latitude and longitude on the map screen in KSP. Youve run into the most-commonly reported one; That the game doesn't properly rectify the longitudes into the 180°E to 180°W range. Mechjeb and and Figaro do. That said, this bug's been in the game long enough that, if you /were/ to put in the improperly-rectified values into, say, Mechjeb's Landing Autoplilot, MJ will put you down on the appropriate site without problems.... As long as you don't run into one of the /other/ bugs in how the map screen displays longitude and latitude.

[lextacy]

so lets say I want to fly a plane to one of those map targets using my GPS from Figaro, I would have to change the "W" to a "E" ?

[maltesh]

I don't know Figaro, so I don't know if it can translate the values directly without you having to convert the values.

If you have to convert, though, you'd need to take the longitude value as a number, and consider it positive if it's East, and Negative if it's west.

If the value is more than 180° after doing that, subtract 360° repeatedly until it's between -180° and 180°.

If the value is less than -180°, similarly add 360° repeatedly until it's between between -180° and 180°.

Then convert back to East and West longitude using convention mentioned above.

Example: 217°17'8" E

+(217°17'8") - 360° = - (142° 42" 52")

Therefore, the corresponding rectified longitude is 142° 42" 52" W.

Edited January 1, 2015 by maltesh