Gmap: How do I customize embeded blocks/nodes through views?

How do I get the Gmap module to display an inserted 'Gmap View' block based on markers that are only from a specific location (city for example) where the markers are dispersed in that map based on the Lat/Long info contained in respective user nodes?

Example: I have a set of users in a certain city (city1) and another set of users in a different city (city2) within those two cities they are further specificed in detail through Lat/Long info within their respective nodes.

User node info from City1 is used to create a View and user nodes from City2 is used to create another view (and so on). How can I create seperate Gmap Views that can have all those nodes displayed by location and marker (divided respective to city)?

I think I amost got it by using the fields setting in views but it isn't working for some reason. I think I might have to add an argument or filter?

How can I also customize zoom and other map settings for different nodes?