Location-based social network Foursquare announced Radar, a new real-time feature that sends users notifications when they're close to a place on their to-do lists, or the any other Foursquare lists they follow, ReadWriteWeb reports.

Radar seems like an especially useful tool if user is in a city he isn’t very familiar with - or if users just are trying to get a better idea of places nearby them, wherever they are.

For example, it a user a pancake-lover who's subscribed to the list Pancakes Across Armenia! and happens to be traveling the country in search of pancakes, he will receive a real-time notification when being near a pancake restaurant on this list.

Users can create those lists themselves, or jump on to one of the pre-made Foursquare lists, like 101 Best Dishes of 2011.

This Radar feature is only available for iOS5 users.