Tell if you are far away from GPS-coordinates

I am thinking of building an iPhone app. Today I saw a man sitting on the bus, and he fell asleep. After plenty of bus stops he woke up.
I want to make an app that gives you an alert before you reach the place you are reaching (by map) and that will be GPS-coordinates I guess. Lets say 500m before.
Is it possible?
Message was edited by: cordoprod

MapKit provides the basics for determining location.
The app would need to know the latitude & longitude of the destination, then it would simply compare the current location...just like any GPS app.
When the offset equals a certain distance, an alarm is triggered such as"You are approaching your destination"...just like any GPS app/device that has a clear view of the sky.
As long as no one calls the phone to say "You are approaching your destination" when the user is 1,501 yards away from their stop, the app could tell the user "You are approaching your destination"...just like any good GPS app.

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