Set the iBeacons minor + coordinates (X, Y) in the beaconCoordinates.plist (identify by minor) and get coordinates of iDevice with trilateration like this:
[MiBeaconTrilaterator trilaterateWithBeacons:foundBeacons done:^(NSString *error, NSArray *coordinates) {
if ([error isEqualToString:@""])
{
float x = [[coordinates objectAtIndex:0] floatValue];
float y = [[coordinates objectAtIndex:1] floatValue];
}
else
{
NSLog(@"%@", error);
}
}];