Operating in Playback 4-25Select Use Altitude from Towfish to run with auto tracking on. This is the defaultsetting when starting SonarPro and should be used almost all of the time.However, if conditions warrant, select Use Manual Setting to enable manualaltitude tracking or select Use Altitude from Towfish plus Manual Offset to enablethe sum of both auto and manual tracking. Once either of these two options isselected, the Manual Towfish Altitude Offset scroll box becomes available whereyou can enter an estimated altitude.The altitude tracking lines in the Sonar Viewer window will change to the colorcyan; the Towfish Altitude display in the Information Window will also change tocyan; and a display with a cyan background will appear in the Sonar Viewerwindow tool bar indicating either "Manual Altitude" followed by the altitude forthe Use Manual Setting option or "Offset Altitude" followed by the altitude for theUse Altitude from Towfish plus Manual Offset option:An example of the Sonar Viewer window with the manual altitude trackingenabled is shown in Figure 4-34.Figure 4-33: The Sub Bottom Profiler Viewer Properties Dialog Box—AltitudeTracker Tab
