Gmap Views - Proximity filter for user locations based off of a specific node location I am trying to build a view that shows the location of any users that are within a certain radius of a node's location. I can get a specific node's location to show up using its nid as the argument, and I can get the users' locations to show up (content profile location), but I can't get BOTH to display on the same map.

I'm thinking the problem is that I only have one option for the datatype that views uses to generate the markers. I've also tried displaying the node's marker through a gmap macro, but when view is displayed, the marker information from the macro is gone, and only the locations rendered by the view's fields are displayed.
This is really a Views question. You can specify a Relationship and a Contextual Filter under the Advanced tab in Views.

I don't know the specifics for Gmap Views, but the principle is the same: You'd make a view of users, with a contextual filter of content:NID. Then you'd create a relationship to nodes based on the location. Gmap Views might give you a way to say 'within x miles of'... This is Views' way of creating a JOIN query.

Then on your content you'd add a Viewfield and tell it to pass the NID to the view. This will attach the view to your node and generate the view of users nearby.

Helpful tutorial about relationships here. Start at about 1:00 if you're impatient. :-)