Navigation
17 questions tagged Navigation — spanning every one of the seven Ws.
How does a compass work?
A compass works because its magnetised needle aligns with Earth magnetic field, pointing toward the magnetic north pole.
How Does a Compass Find North?
A magnetic compass needle is a small magnet that aligns itself with Earth magnetic field — since the field lines run roughly north-south, the needle north-seeking pole points toward Earth magnetic north.
Why do sea turtles return to the same beaches to lay eggs?
Female sea turtles often nest on the beaches where they hatched because they can navigate back using a combination of Earth’s magnetic field, ocean cues, and learned location memory. This behavior is called natal homing.
Why do sea turtles return to the beach where they hatched?
Sea turtles use a powerful natal homing instinct, guided partly by Earth’s magnetic field and ocean cues. Females often nest near the same beaches where they were born.
What is a lighthouse?
A lighthouse is a tower or structure that emits light to guide ships and warn them about hazards.
Whose work first mapped the oceans’ major surface currents?
Matthew Fontaine Maury produced some of the first systematic charts of winds and currents in the mid-19th century. His “Wind and Current Charts” helped sailors cross oceans more efficiently.
How do GPS satellites know where you are?
Your device measures the time signals take to arrive from several GPS satellites. By comparing those times, it calculates your position on Earth.
How do GPS satellites calculate your location?
GPS works by measuring how long signals from at least four satellites take to reach a receiver. Those timing differences let the receiver calculate its position by trilateration.
How do compasses find magnetic north?
A compass needle aligns with Earth’s magnetic field, so its north-seeking end points toward magnetic north. Magnetic north is not the same as geographic North Pole and slowly moves over time.
How do sea turtles know where to return to lay their eggs?
Sea turtles use Earth’s magnetic field like a natural map and compass. They can remember the magnetic signature of their natal region and return years later to nest.
How do scientists calculate the speed of a spacecraft in deep space?
They track radio signals and measure Doppler shifts, timing delays, and ranging data from Earth. Tiny changes in frequency reveal how fast the craft is moving toward or away from us.
Why do some birds use Earth’s magnetic field to navigate?
The magnetic field gives birds a directional cue when landmarks are unavailable. It is especially useful during long migrations across open water or unfamiliar terrain.
When did scientists first discover that birds could navigate by the Earth’s magnetic field?
Evidence for magnetic navigation in birds emerged in the mid-20th century, with key experiments in the 1960s and 1970s.
Whose work first showed that fish can navigate using Earth’s magnetic field?
The classic evidence is associated with Franz and Eleanor Persaud and later researchers such as Kenneth Lohmann and Cathy Lohmann. Their experiments in the late 20th century helped demonstrate magnetic orientation in sea turtles and fish.
How do sea turtles navigate across thousands of kilometers of ocean?
They use Earth’s magnetic field, ocean cues, and learned routes to travel between feeding areas and nesting beaches.
How do sea turtles know where to return to lay eggs?
Sea turtles appear to use Earth's magnetic field as a navigational map. Many females return to the general region of the beach where they hatched.
How do salmon smell their way back to their home stream?
Salmon use a highly sensitive sense of smell to recognize the chemical signature of their natal river. This olfactory map helps them return to spawn after years at sea.