Direction from one location to another in Maps application

-(IBAction)directionButtonpress:(id)sender{

        NSString *destnlat=@"40.984042";
        NSString *destlong=@"-74.009993";
       
       // NSString *currentlat=[[NSUserDefaults standardUserDefaults]objectForKey:@"latitude"];
       // NSString *currentlong=[[NSUserDefaults standardUserDefaults]objectForKey:@"longitude"];
       
        NSString *currentlat=@"40.982435";
        NSString *currentlong=@"-74.016427";
       
        NSString* url = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=%@,%@&daddr=%@,%@",currentlat,currentlong,destnlat,destlong];
       
        NSLog(@"%@",url);
       
        [[UIApplication sharedApplication] openURL: [NSURL URLWithString: url]];

}