There are hidden maps on dark orbit. to find them, follow this guide.

I reccomend not doing this unless you have a bigboy, a vengence or goliath.

go to map x-4.

you will find a jumpgate in between two other ones. go through it.
next, go to the center jumpgate.(you will find that you can not see it on the map that pops up after you jump) go through it. you are in a secret map!

explore but beware! the jumpgates do not offer protection!