Geocode Factory - Data form module allow you to use the Radius search for the map on any page of the site, even there is no map on the page. Like here. The module will redirect the user on the map page with the selected radius.

Sobipro Nearby entries
What is near this entry?
Select a radius, and all entries near the current will be displayed
Geocode Factory 5
Joomla 3
Create an unlimited number of Google Maps
Compatibility many extensions.
Geocode Factory 3
Joomla 1.5 to 2.5
Create an unlimited number of Google Maps
Compatibility many extensions.