[IMAGE: https://img.esteem.ws/card5d62un.jpg]

Sometimes things change while at sea, windmills are built, buoys are placed in locations signifying direction or obstruction, sometimes countries change their radio signs and many more, it's the job of the navigator to identity these changes and effect them on the chart and books to enable safe passage.

[IMAGE: https://img.esteem.ws/b9v9lv3k0v.jpg]
Follow and upvote for more on my experience at sea.