Setup -> Horizon

This controls how a local horizon profile is defined. Whether it is drawn is determined by the Horizon toolbar button. If a profile is on it will be drawn as a red line on the sky and objects that fall below the profile are not drawn. Note that the rise and set times reported elsewhere do not take into account this horizon.

• Use flat horizon This method sets a constant angle at which the horizon profile is set for all azimuth angles. The altitude of the profile is set using the field at right.

• Use above custom map This method lets you draw your profile in the map area at the top. Hold the stylus down and draw or edit the desired portion of the profile. The scale goes from 0 to 90 in altitude and 0 to 360 in azimuth; azimuth is in degrees eastward from north.