In navigation, what is used for determining direction?

In navigation, determining direction is primarily achieved using North references. Among the options provided, Grid North is specifically used in the context of map-reading and navigation. It refers to the direction northward along the grid lines of a map, which are often aligned to the Earth’s coordinate system.

Grid North is particularly important for those navigating using topographic maps, as it allows for accurate readings and plotting of positions based on the grid. This alignment ensures that navigators can convert between their map and the real-world terrain effectively.

Other options may suggest different north directions relevant to specific contexts. For instance, True North refers to the direction along the Earth's surface toward the geographic North Pole, while Magnetic East relates to magnetic declination and compass readings. Hill North might pertain to direction based on prominent topographical features (though it isn't a formal navigational term). However, when a precise and universally applicable method for direction determination is required, Grid North stands out as the correct choice in navigation practices.