Garmin GPSMAP 3005C - Manual (Page 102)

 GPSMAP 3005C Owner’s Manual
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• Bearing Reference—sets your bearing, either Absolute or Relative.
Relative calculates the bearing relative to the 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.
MARPA Sub Tab
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.
• Safe Zone Ring—displays a ring on the Radar Page depicting the Own
Vessel Safe Zone.
• Velocity Reference—has two settings, Absolute and Relative. This
setting determines how speed and direction are displayed on the MARPA
list. Relative calculates target speed and direction relative to your own.
Absolute shows the target’s actual speed.
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