Garmin gmr 404 用户手册

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•  Rings—toggles the radar rings on or off. 
•  Background—sets the background color for the Radar Page. 

Available options are Black, Blue, or White. 

•  Heading Line—toggles the heading line on or off.
•  Bearing Reference—sets your bearing, either Absolute or 

Relative. Relative calculates the bearing relative to own vessel 

heading. Absolute calculates the bearing referring to North. 

•  Navigation Features—allows you to show or hide 

navigational features on the Radar Page. Use the ROCKER 

and the ENtER key to select or clear options.

  •  Waypoints—show user waypoints on the Radar Page.
   •   Bearing Line—show a bearing line on the Radar Page. The 

bearing line appears as a line from your current position 

to the active destination waypoint, similar to a traditional 

lollipop.

  •  Course Line—show a course line from your starting    

  point to the active destination waypoint, which is similar to  

  navigation on a map.

The MARPA sub tab contains settings for Vector Length, Target 

History, Own Vessel Safe Zone, Time To Safe Zone, Safe Ring Zone, 

and Velocity Reference.

The available MARPA sub tab options are:

•  Vector Length—predicts the target’s approximate position at 

a set time interval. This setting determines the length of the 

Vector Line, based on the time interval setting and the target’s 

speed. The time interval settings range from .05 minutes to 60 

minutes.

•  target History—is a trail showing a target’s movement. Target 

History can be turned On or Off.

•  Own Vessel Safe Zone—is a circular area defined by a range 

setting that is centered on your own vessel. If a target enters the 

defined area an alarm is sounded. The Safe Zone can be set to a 

distance between .01 and 2 nautical miles.

•  time to Safe Zone—sounds an alarm if MARPA determines 

that a target will intersect the Own Vessel Safe Zone within the 

defined time interval. The time interval settings range from 3 to 

24 minutes.