What does GPS accuracy depend on?

GPS accuracy primarily depends on satellite configuration, signal quality, and atmospheric conditions. The Global Positioning System relies on a network of satellites that transmit signals to GPS receivers on the earth's surface. The configuration of these satellites determines how well a GPS receiver can triangulate its position based on the signals received.

Signal quality is critical because various factors can affect signal strength, such as physical obstructions (like buildings or trees), interference, and even the geometry of satellite positions at any given time. When satellites are widely scattered in the sky relative to the receiver, the accuracy improves. Conversely, when satellites are clustered together, accuracy can decrease due to reduced geometric dilution of precision.

Atmospheric conditions, such as ionospheric and tropospheric delays, can also affect the transmission of signals. These atmospheric layers can refract the signals, causing delays that lead to inaccuracies in determining the receiver's position.

The other options, while related to maritime operations and navigation, do not directly impact the technical functioning and accuracy of GPS technology. Weather forecasts and sea currents are more relevant to navigation challenges rather than GPS signal accuracy. Similarly, chart updates and electronic maintenance focus on the maintenance of navigation aids rather than on the fundamental accuracy of GPS signals. Local regulations and maritime laws