Mark,
I think I can supply information, for your benefit.
1.) The CORE coord system in the LS is LAT LON. From there we take a trip. Alterations, based on epoch date. This CORRECTS the fact that pieces of the earth are MOVING. Such as Plates of the earth are MOVING.
2.) From the Lat Lon we get a projection. That's a BIG flat spot on the surface of the earth. This would be like SPC Arkansas South, Arkansas North etc.
3.) From there, we get a LDP. Low Distortion Projection. That's a LITTLE flat spot, co-related to the SPC that underlies it.
So, what we have here, is a Lat Lon, then Math applied, to it, that shifts it by the epoch date. Then we via math, PROJECT that to the surface of the earth. Then, via math, we make a LOCAL system, or LDP. All this is MATH. The core is Lat Lon.
So, you have a selection of PAGES. Simply set PAGE zero, to LAT LON. Page 1 to SPC. Page 3 to LDP. Now, as long as you select the page correctly, you will be able to PRETEND that nothing is going on, while all that math is going on, for you.
It's a dream come true, isn't it?
Ask more questions, learn more.
Nate