'So make yourself an ark of cypress wood; make rooms in it and coat it with pitch inside and out.'
Throw in the fact that our fore-bearers sailed/navigated? to Crete 100k plus ya.
You can do things for a hobby. But, if you life is in on the line, ya learn quick.
Amen.
In theory, theory and practice are the same. In practice, they aren't.
/johnny