This is when digitizing occurs with out hardware or tools. A light table was used. A piece of grid paper was laid on top of the table, then a map over the grid paper. The puck is similar to a mouse used for a computer. Resolution is what the unit displays at.
Digitizers are fairly trouble free and come in a variety of sizes.
Some have microprocessors that convert the information to different formats. Software Software is needed to work with digitizing. It takes in the coordinates and stores them in files as well as displays them on screens. A very important function the software does is keep track of control points. Some are able to convert points into another projection such as latitude and longitude.