the astrolabe and compass
Astrolabes and maps
The stars or a sextant or GPS or radar or sonar ( underwater)
Astrolabes and maps
The sextant helped explorers by allowing them to determine their latitude at sea by measuring the angle between the horizon and the sun or a star. This helped navigators plot their position on a map and accurately navigate the vast oceans.
Before compasses were invented, navigators relied on observing the position of celestial bodies such as the sun, moon, and stars, as well as natural phenomena like winds, currents, and bird migrations. They used these natural cues to navigate their vessels across the oceans.
Actually, no LAND mass protected the US and Canada. Rather, the vastness of the Pacific and Atlantic Oceans provided a very large distance barrier to their opponents. Any invader would have to cross these oceans to get to North America, and doing so is a logistical and technological nightmare.
Well... A good example is iron fertilisation of the oceans which encourages blooms of plankton which will lead to the removal of excess CO2.
A navigator's map is often referred to as a nautical chart or a navigational chart. It is a specialized map used by sailors and navigators to help navigate the seas and oceans.
200 years ago
From my understanding, their were 94 oceans used. I remember my great grandfather telling me this because he was in world war II. I hope this helped you retard.
Poseidon was a good greek god who was the god of the oceans and helped protect the ocean cities
pacific ocean, indian ocean, and the apple ocean hope i helped :3