Mercator projection

The Mercator projection is the most common projection used in marine navigation.
On a Mercator chart:
The lines of latitude and lines of longitude remain parallel and they cross each other at right angles.
The directions can be accurately plotted, and a course can be plotted from one point to another, making it possible to sail along that line (this is called the Rhumb Line) by steering a single compass course.
The Rhumb Line crosses all meridians at the same angle.
The shape of an object is accurately represented.
Sailing towards the poles, the objects appear larger than they actually are.