On the newer series (320, 520, and 720) that use MioMap 3.3, there's a new tab in the cockpit display called "Nearby POIs". When you select this, it shows a list of the nearest POIs with their icon, name, distance, and direction.
It doesn't work when searching for POIs though. You need to first use Manage to turn on the category you are interested in. By default, it is set to show the nearest gas stations.
I'm going to try attaching a picture I cut from the 3.3 user's guide...

The stock C310x comes with MioMap 3.2, and that feature isn't available. You could turn on the POIs for all the Taco Bells, so they'd appear on your map view, but you don't have the "nearby" feature with the direction indicator.