Relative track information
Predicted time of CPA
Initial range of acquisition
Set and drift of the current
Radar calibration beacon
Radar transponder beacon
Radar conspicuous beacon
Circular radio beacon
Forgetting that this actually is a mixed mode
The ARPA symbols becomes unstable
Overloading the computer
The target warning are no longer relevnat
Lost motion adjustment
Reduce the sea echoes
Remove wash return from the propeller
Increase brilliance of large echoes against sea
Intensify sea return
Radio detection and ranging
Radio detection and reconnaissance
Radio display and reconnaissance
Radio Director and reviewer
Target can no longer be plotted
Increase the STC setting to reduce close-in spurious signals.
Increase the radar gain to pick up weak echoes through the rain.
Navigate as though the effective range of the radar has been reduced.
Increase the range of the inner and outer guard rings.
Here's an interesting quiz for you.