Markers are used to highlight specific frequencies of interest.
Click the "Mrk" button on the Spectrum plot toolbar to access the marker settings dialog box.
Labels can be applied to the markers. If custom labeling is selected, you may enter up to 30 characters of text.
Markers can also be set graphically by clicking the right mouse button in the spectrum view. This will bring up the Right Click Action Menu. Choosing one of the "Set Marker #" commands will set the marker frequency corresponding to the mouse click position. The "Clear All Markers" option will simply hide all markers; they can be reactivated by enabling them in the <Options><Markers> dialog box.