Magnetic Variation; Arrival Radius - Lowrance Mark-4 Operation Manual

Arrival Radius

Sets the arrival radius threshold for the Arrival
alarm. The arrival alarm will sound when your ves-
sel comes within a selected distance (arrival radius)
of the destination waypoint.
Off Course Distance
Sets Off Course Distance threshold for the Off
Course alarm. When the selected off course dis-
tance is exceeded, the Off Course alarm will sound
when the alarm is enabled.
Bearings
Controls whether bearing will be calculated using
True North or Magnetic North. Magnetic North
should be used when navigating with a compass
course or heading; otherwise use the default set-
ting, True North.
Chart Operation | Elite series

Magnetic Variation

Controls whether magnetic variation will be calcu-
lated using Automatic or Manual settings. Magnet-
ic variation is the angle between magnetic north
and true north. The automatic setting reconciles
the variation for you.
WARNING: You should only use the
Manual magnetic variation setting if
you have variation information from a
verified source.
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