Hello @stanleyboise,
A Posts Locator Form is a full proximity search system. It includes a search form and dynamic search results, allowing users to search and filter posts by location (distance, radius, etc.), essentially creating a directory-style experience.
A Posts Mashup Map, on the other hand, is much simpler. It displays locations of posts on a single map, but without any search form, filtering, or dynamic results.
I hope this helps.
Let me know if you have any other questions.
Thank you Eyal for this great explanation. It is now clear to me.