Lowrance electronic GlobalMap 12 - Manual (Page 46)

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CANCEL NAVIGATION
The GlobalMap 12 continues to navigate to a re-
called waypoint, the last waypoint in a route, or the
cursor position until you stop it.
To stop the navigation function, press the MENU
key, then press the up or down arrow keys until the
“Cancel Navigation” label is highlighted. Press the
right arrow key. The unit stops showing navigation
information to the waypoint.
SYSTEM SETUP
The GlobalMap 12 has several menus and
commands listed under the “System Setup” la-
bel on the main menu. To use these, press the
MENU key, then press the up or down arrow
keys until the black box is on the “System
Setup” label. Press the right arrow key. The
screen shown at right appears.
TRACK HOLDING
Your GlobalMap 12 has a special feature called "Track Holding" that pre-
vents the unit from showing random numbers on the navigation screens
when you're travelling less than 3 miles per hour. These random numbers
are mostly caused by S/A (Selective Availability). S/A is random errors
introduced into the GPS satellite network by the government to degrade
the system's accuracy to the general public. The error can be as bad as
100 meters and 5 m.p.h., which is within the government's GPS specifi-
cations. You can see this happening when you're standing still with the
track holding feature turned off. With it turned off, your present position
will move on the map even though you’re standing still.
The track holding feature works by locking the track at the last known
direction when you slow below three miles per hour. Above three miles
per hour, the track holding feature is disabled. This feature is automati-
cally activated when the unit is turned on for the first time or after you
preset it.
You'll see the unit's track "lockup" when you slow below 3 miles per hour.
If you have the unit in the "track-up" mode, the map will also lock in the