what light does the opening scene throw on the danger that the sea could pose to ships?

the question is merchant of venice work book.act-1,scene - 1. from this paragraphSALANIO: Believe me, sir, had I such venture forth,

The better part of my affections would

Be with my hopes abroad. I should be still

Plucking the grass, to know where sits the wind,

Peering in maps for ports and piers and roads;

And every object that might make me fear

Misfortune to my ventures, out of doubt

Would make me sad.