Oggin, you beat me to it!!
Potentially 100+nms from mum and down at 50 feet. No chance in the ship's radar holding that
Also, what if the ship is emcon silent??
That aside, even if you are operating in emcon silence, the point at which either the Aircrew or Ops Room on mum realise something is not right, surely that is the time to break silence and get everyone heading in the right direction to avoid tears and "off caps"