Marine Electronics Questions? Ask a Technician for Answers ASAP
When "the message “NO HEADING PULSE” or “NO BEARING PULSE” appears, you should check that the antenna cable is firmly connected.
Check all connections are secure and no wiring is damaged.
Let me know how you get on.
Next you will need to test the unit with a different dome to rule out a problem with the antenna; or you could test a different unit using your antenna.