A running fix (often referred to as a “run fix” or “RFix”) is a navigational technique used to determine a ship’s position by using two or more lines of position (LOPs) taken at different times and advancing or retiring one or more of them to the time of another, thus obtaining a fix. Here’s how…

One of the biggest points of confusion with Danger Bearings is understanding the difference between heading/COG vs CHANGE in bearing. If you look at the bearing as a heading. This is the core confusion behind NLT (Not Less Than) or NMT (No More Than). It has nothing to do with the direction this idea sends…

A sextant is a navigational instrument that is used to measure the angle between two visible objects, typically the horizon and a celestial body such as the sun or a star. The sextant is typically used to determine a vessel’s position at sea by measuring the altitude of the celestial body at a specific time.…