Menu Mode 45Lost vessel alarmsA Lost Vessel Alarm occurs when the reception from a vesselhas been lost for a period of time, which has been determinedby its missed transmission periods and last known speed.This function allows the user to activate a warning messageeach time a vessel is lost from within the current display range.From the “Alarm Setup” menu highlight “Lost VesselAlarm” and select it. The display changes to show theactivation status and current setting.Figure 6.14 – Lost Vessel AlarmAudible/visual warning - if enabled, will activate anaudible and visual alarm each time a vessel is lost fromAI50 reception.To activate the “Audible/Visual Warning”, highlight it andsimply select it. A tick appears in the box, indicating thealarm is now active, and using the value shown.Lost vessel persistence - When a vessel has been lostfrom AI50 reception, its icon will change to a lost vesselicon. Refer to section 7.2. Lost vessel persistence is theuser assignable time period for which this lost vessel iconwill remain on the screen.To change “Lost Vessel Persistence”, highlight and selectit. The value is now highlighted.Scroll through the predefined values and select the mostappropriate one, (1 min. – 30 min.), then select it.The cursor returns to highlight “Lost Vessel Persistence”.or Xor Xor Xor Xor Xor X