IMG quest in EM (spoilers)

[KaosProphet]

Not sure if this is right place for this.

I've done the quest up to the second combat mission. At the end of it, I'm warned that the next mission is going to be even more difficult. I'm also given directions to the next hidden stash, but... the directions don't add up. "on the surface of planet x in a shipwreck" and "coordinates for stash are x y z" - coordinates nowhere near the planet mentioned.

So... which is it? Or does the coord system differ when used in respect to a given planet?

[Marvin]

The navigation system includes two sets of coordinates: sector coordinate (SX, SY and SZ) and "sub-sector" coordinates (as Spock would say). Sometimes, instead of being given sector coordinates, you're given the name of a planet ... 'cause you'll only find one planet in any specific sector. Then, you'll be given a set of sub-sector coordinates to find ... after you've reached the correct sector.

[KaosProphet]

It's the 'on the surface' that's throwing me :/

[Marvin]

Make sure you're searching the correct planet. If you are, and you plug the correct sub-sector coordinates into the Destination windows, you only need to fly toward the Nav point (don't jump) and look for the purple blip on radar.