What is the difference between the concepts of reference system and coordinate system?

The concept of a coordinate system is used in mathematics and in geography, where it is only necessary to establish the relative position of objects or their length. The main task of mechanics is to determine the position of a material point at any moment in time, which means that knowledge of the coordinates of the body is not enough, it is necessary to establish their dependence on time. Therefore, in physics, a reference system is used, which includes: 1) a coordinate system; 2) the reference body, in which the origin of coordinates is placed (usually it is associated with starting points, for example, a train station, airport, etc.); 3) a device for measuring time.