Unit of longitude and latitude measurement?

Answer 1

Latitude and longitude are angles. So any unit of angle will work.

Examples include radians, grads, degrees, etc.

Mostly on account of seafaring tradition and the history of navigation, these

coordinates are still almost always listed and stated in degrees (and fractions

of degrees, like decimals, or minutes and seconds).

Answer 2

Latitude and longitude are angles. As such, any angle unit may be used in principle,

but these particular angles are virtually always stated in terms of degrees, along with

either the classical subdivisions of degrees ... minutes and seconds ... or else common

decimal fractions of degrees.