Old seafarers used the seem techniques as explained in these materials. Symbols are dealt with and plotting and magnetic etc. These techniques are proven and time-honored. You can learn this on this website. Yet, you don't have to pay any money.
Health is everything and paramount when enjoying the great blue.
Symbols are dealt with and plotting and magnetic etc. You won't need electronic equipment. This is a new international knowledge base. For safe boating it is essential to know the positioning methods. You won't need electronic equipment.