Tandem and Bob yet again you wax lyrical and completely miss the point.
Departing with something U/S under an MEL generally involves restrictions. Risk based alleviations based on experience and mission requirements.
RADAR - is the only reliable source of obstacle information, IMC, over the sea. The point being, had the crew observed their 5.5 km COCIS rule the need for Radar is extant. However, if you are going to fly at 150 KIAS over water, less than a mile from a mountain in fog, aiming at it, Radar is definitely required.
Tandem, the EGPWS is geographically accurate but the database might be bollocks or the baralt ****e. You could post your missile but it might not hit the bit on the screen you are looking at. I thing GPWS is a great tool but it is second fiddle to the radar over water.
I do not feel the need to enter an argument about my experience or otherwise. Suffice to say I am well qualified to discuss this subject.
Yet again a nice try to deflect the issue from the relevant to the irrelevant.
What else have you got the relates to this thread subject.