diaphones warn vehicles of navigational hazards like rocky coastline, or shoals, in foggy conditions

diaphones carry horns that are sounded at regular intervals by mechanical or electrical means

diaphones carry a whistle that is activated by the rise and fall of the buoy on the seaways

diaphones have a series of hammered gongs mounted in a vertical stack, each with a different tone, moved by the motion of the sea

sign

beacon

horn

lighthouse

cycle

gong

radio navigational aids

radio weather and Nav warning services

shore stations services, IDs, frequencies, classesof emission, details on the use of INMARSAT

 GMDSS

a list of contents of the almanac, a calendar of the phases of the Moon, the year’s calendar, maps and notes that give information about the occurrence of eclipses over the year

tables for the correction of altitudes of Sun, stars and planets 

data about refractional corrections

tables for low altitudes of observationsof Sun, stars and planets

Ocean Passages for the World

Notices to Mariners

The Mariner’s Handbook

Sailing Directions

you need to use Tide Tables

you need to use the Mariner’s Handbook

you need to use Sailing Directions 

you need to use the Nautical Almanac