We had 1 unit based on the Treasure Finder as a declared facility available for use by the Coastguard (though it was paid for by Shell and available primarily for use in the Brent field).
so how many were there available for UK-wide SAR? How many rescues was it used on? Our FLIR turret has been used on hundreds if not thousands.
As for LN400 - that was an autopilot and predecessor to the excellent SN500 as used in Mk3A RAF Sea Kings but never taken up by RN
