Low Flyer
I can only imagine the heated 'debate' in the RN's bit of (MoD) Main Building in Whitehall when they considered the implications of using that gear openly and actively within 'earshot' of a couple of Chinese oceanographic research ships! I think there'd have been much tossing of rattles out of prams and quivering lower lips and tears before bedtime for the Admirals who wear dolphins on their jackets.
Which explains why this particular boat was chosen. It is the sole member of its class that has not been retrofitted with the new sonar systems. So the 'ears' of those listening will be listening to history - and the only information is that whatever they hear, the new kit is better.
