Free Google Map Plugin

I am wondering if anyone can suggest a free google map plugin that would provide us with the following features;

– A map on a page or post that guests would be able to enter an address
– once an address is entered then the marker is always visible until removed
– addresses can be removed by the administrator

This is for a specific project so the addresses will local to us.

If the plugin I need is not free what one would you suggest.

Please remember that the plugin has to be user friendly as I am not completely literate with WP. I learn as I go along.

Thank you for any help I receive.

PdV