OurAirports has records for 3 different navaids with the identifier "CRN". Please select the one you'd like to view.
Ireland
342 KHz (CRN -.-. .-. -.)
-.-. .-. -.
Italy
117.10 MHz (CRN -.-. .-. -.)
United States
281 KHz (CRN -.-. .-. -.)