Up and down buttons are used for navigation purposes.

Marine radars are used by ships for collision avoidance and navigation purposes.

A significant number of ferries were provided specifically for navigation purposes.

It is used for fish and wildlife protection, flood control, and improved navigation purposes.

Used for navigation purposes, these channels are managed by the U.S. federal government.

The difference between grid north and true north is very small and for most navigation purposes can almost always be ignored.

From 1862 the Brisbane River has been dredged for navigation purposes.

Stars were used for navigation purposes and were occasionally also seen through cabin windows when the conditions allowed.

Construction of the remaining weirs purely for navigation purposes was abandoned in 1934.

During medieval times, the stereographic coordinate system was used for navigation purposes.