How to remove all annotations from MKMapView without removing the blue dot?

I would like to remove all annotations from my mapview without the blue dot of my position. When I call:

[mapView removeAnnotations:mapView.annotations];

all annotations are removed.

In which way can I check (like a for loop on all the annotations) if the annotation is not the blue dot annotation?

EDIT (I've solved with this):

for (int i =0; i < [mapView.annotations count]; i++) { 
    if ([[mapView.annotations objectAtIndex:i] isKindOfClass:[MyAnnotationClass class]]) {                      
         [mapView removeAnnotation:[mapView.annotations objectAtIndex:i]]; 
       } 
    }