Garmin GPS 75 - Manual (Page 46)

6-4
automatically calculated magnetic variation shown. For most
applications, the “Auto Mag” feature will provide accurate heading
information. If the auto-magnetic variation is not correct, you may
define the magnetic variation by selecting “User Mag Var”. If the “User
Mag Var” option is selected, the magnetic variation is then entered.
To enter a user-defined magnetic variation...
· Highlight the “HDG” field and select “User Mag Var” with CLR.
· Press ENT.
· The variation direction is highlighted. To change the direction,
press CLR.
· Press ENT.
· Enter the variation degrees and press ENT.
6.4ALARMS AND CDI SETUP
From the Alarms/CDI Page, you may
define three alarms (and turn them
on or off) and configure the graphic
CDI to your preference. Alarms are
available for anchor drift, arrival at
a destination waypoint, and an alarm
clock.
To set the anchor alarm...
· Highlight the anchor alarm distance and enter the maximum
allowable drift. CAUTION: Setting the anchor alarm to its
smallest value (.01 unit) may result in a false alarm. Please note
that under certain circumstances (below average satellite geometry,
degraded reception, etc.) the position error of the GPS 75 may be
greater than the lowest scale settings available for this alarm.
· Press ENT.
· The on/off cyclic field is highlighted. If the alarm is not turned on,
press CLR.
To set the arrival alarm...
· Highlight the arrival alarm distance and enter the distance from
a destination at which you want the alarm to sound.