The db_chart command draw a map of the objects selected from one or more catalogues inside an area defined by means of sky coordinates:

The user can work on equatorial, galactic or supergalactic coordinates.

Many catalogues can be superimposed on a map and displayed with different colors or symbols.

Can be used different projection like "Mercatore", "Lambert "...

.... "Orthohraphic" ....

..... and "Hammer Aitoff" with Zoom and Window interactive selection.

The user can plot error boxes relative to catalogues object.

Moreover "by cursor" the user can point and get information about the objects in the map.