Hm .. I did some checks .. and really .. I don't see how to do it. HF is not even a sensor in database, it is just a different 3D view.
I think reasonable ranges would be 1-2 miles for detection, 5 miles counter detection .. or something like that .. you whould know when it is safe to use. You should be pretty sure with your 5nm vicinity.
But let's discuss the possibility of doing it first.