I don’t understand the new arrival distances in system maps

[Allcoast]

In Pre Odyssey, I could pull up a system map and check the arrival distance to a location from the entrance into the system. If I was in the system, it would be relative to my position.
In Odyssey, I have no clue how they are calculating. For instance, when I pulled up one of the orbitals in the Nehemi system, if I was not in the system, it showed like 13.4KLs as the arrival distance, but when I jumped in, it was like 600. Why should I have to use an external website to calculate local distances.
And also, who’s leg do I have we have to hump get a jet cone. Holy crap.

 

[Allcoast]

Notice the distance in the screenshot, that is from outside the system. If you look up this station on the web, you will see that it is actually around 600ls arrival distance.

 

[Bigmaec]

Oh, at least that's a new one iirc.

 

[CmdrKull]

Can you check the Orrery map? Possibly it as a closer approach?