How can I show all listings on the map for each post type archive?

Hi there,
I’ve done a bit of research on this and it is my understanding that there is one map view that is designed to show all the listings in the database (the Home Page Map). However, I have my listings divided into 4 categories (Schools, Merchants, etc) and would like to be able to have this functionality on each post type’s main (archive) page. Currently the main page for each listing type just shows the first page of results. This is causing the map to be centered in odd ways.

I’m really hoping there’s a way to do this. My client is reporting that this functionality existed at some point in the past, but no longer works. I’m lost. Any help would be much appreciated!

Thanks in advance.