On the following ILS chart, there is a number 301°. Is the number 301° indicating a track angle, heading or something else?
An approach plate is a map, so the directional values presented are always magnetic track angles (except near the magnetic North Pole). A heading is where the airplane points when it's flying. So, 301° is the track of the localizer course, in degrees magnetic. Makes sense, as it's the approach to Runway 30.
In the Arctic, in some areas the magnetic compass is usable and some areas it's not, so the value will include a "T" (301°T) if the track is a True Track, or an "M" (301°M) if it's a Magnetic Track. If there is no T or M, assume the value is magnetic.