Or even sail on the surface
Even then the Dark Blue still have problems. The fellow referred to below should have gone to a well-known spectacles supplier:
"
A Royal Navy officer who was skippering a racing yacht that hit an oil tanker in the Solent has been found guilty of contravening maritime regulations."
"Mr Wilson, who was a serving Royal Navy officer at the time but is now a lieutenant in the reserves, had seen the tanker from five miles (8km) away, Southampton Crown Court heard."