Adding GPS for boulders in app?

Maybe I am just too new to the app, finally actually getting a username after using it for months, but I am unsure how to add GPS location of boulders not listed on the map. The boulders are listed in the area but not GPS mapped. I wouldn't mind doing this to help out fellow unfamiliar climbers, but I cannot seem to find a spot to do so.

You can't do it in the app (for now), but on each boulder page on the web site there's a "Show us the Location" button if we don't know it. Thanks for helping fill out the data!

I may be asleep here, but why not just add it in the comments section? Be good to have it in the page top description, but for the moment, comment.

EDIT: DUH

Because if you use the proper tool and locate it on the map (which gives us GPS coords), the app will be able to show it's exact location on map, including your blue blinking dot as you walk right to it!

Oh you guys and your high tech gizmos. I am so 2003. Still have a pay as you go flip phone, no smartness to it. (I live miles from any cell service in way rural Norcal).
SO does this app work for base of routes, too? As in, sometimes trying to find things (J-tree and obscure walls in the Sierras come to mind)?
The oooooollllldddd man.

The incarnation of this feature came about after I wandered around Wonderland in Josh for a couple hours not finding my chosen route...

We don't have proper locations for everywhere, but when we do, it can be super helpful.

So, as i said, i'm old...school. Actually bought a GPS device for J-tree and such, into which you can store co-ordinates, and go off searching. (The most lost i have ever been was in Wonderland, WITH the gps!)
So, the question is, do the co-ordinates only show up on the app? Not my laptop? Is there a reason, other than dinosaurs (moi) to have that?
I have used the mapping for areas, never for routes.
My device, when i have good triangulation, is pretty close, btw. +/- 20'?

Nick, if you cache the map in Maps, can it be shown in the MP app when you have no network?