How to check if current coordinates are within a radius of other coordinates

Question

I have latitude and longitude of a fixed location. I want to check if another location (latitude and longitude) is close enough (50-100 meters) to the fixed location. I use iPhone to get current location.

Answer 1

The method – distanceFromLocation: of CLLocation is exactly what you need.

Answer 2

distanceFromCurrentLocation = [userLocation distanceFromLocation:destinationlocation]/convertToKiloMeter;
if(distanceFromCurrentLocation < 100 && distanceFromLocation > .500)
{
    NSLog(@"Yeah, this place is inside my circle");
}
else
{
    NSLog(@"Oops!! its too far");
}

This finds the air distance, or we can say, straight line distance only.
Hope you are not looking for road distance.