NavMuseum: How people learned to find their place

Field notes

The lessons treat a position as an inference from observations, not a reading an instrument simply supplies. The page lays out what different measurements constrain: a pole-star altitude gives a circle of latitude, a radio bearing gives a line, and synchronized-station timing gives a hyperbola. Its chapter list also connects the mechanics to practical artifacts, including sextants, chronometers, and nautical almanacs.