A GPS receiver on a yacht determines the vessel’s position by communicating with a network of satellites that orbit the Earth. These satellites constantly send precise time and position signals. The receiver compares the signals from several satellites at once and calculates the yacht’s exact location on the water. This principle is known as satellite based positioning and has become one of the most important tools in modern navigation.
To determine a two dimensional position, meaning latitude and longitude, the GPS receiver must connect with at least three satellites. For a fully accurate reading that also includes height above sea level, a connection with four or more satellites is required. At sea, it is common for a receiver to use between eight and twelve satellites at the same time, which greatly increases accuracy.
A GPS does more than simply display the yacht’s position. It also provides useful information such as
One of the major advantages of GPS at sea is that it does not depend on land based signals. No radio towers, coastal transmitters or visual contact with land are needed. As long as the receiver has a clear view of the sky, the system works even far away from the coast.
Modern navigation systems often combine GPS with other satellite networks such as
This improves accuracy and reliability, which is especially important on long offshore passages.
Even though GPS is a powerful tool, experienced captains never rely on one system alone. They combine GPS with seamanship, visual navigation, radar, depth sounders and traditional charts. This ensures safe navigation even if signals weaken or a device fails.
For guests on board, GPS is fascinating because it shows the yacht’s exact position in real time. For the crew, it is an essential instrument that supports planning, safety and confident decision making at sea.
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