NorthStar 957 Operator's Manual page 136

Chapter 10 - Using Special Functions
Page 128
To set the cross-track alarm:
1. Press the CURSOR PAD to highlight CROSS TRACK, then
press the EDIT ALARM menu key.
2. Press the CURSOR PAD to turn the alarm to ON.
3. To set the cross-track distance limit, press the CURSOR
PAD right, and use the KEYPAD to enter the distance,
then press the ENTER key.
Arrive radius
The arrive radius is a circle around your current active
waypoint. The default setting for the radius is 0.20 nautical
miles, or about 1200 feet. You can set the radius to as little as
0.01 nm.
There are two alarms triggered by the arrive radius. If you're
following a route and have chosen automatic waypoint
switching, entering the radius makes the 957 switch to the
next leg and display the CHANGING alarm icon. If there are no
more waypoints in the route, or if you've chosen manual
waypoint switching, then entering the radius triggers the
arrive alarm.
Note: Automatic waypoint switching will also occur if you
cross the perpendicular at the end of the current leg.
To set the arrive radius:
1. Press the CURSOR PAD to highlight ARRIVE RADIUS,
then press the EDIT ALARM menu key.
2. To set the distance around waypoints, use the KEYPAD to
enter the distance, then press the ENTER key.
DGPS alarm
The DGPS alarm will signal if you were using GPS or Phantom
loran fixes, but valid, usable beacon or WAAS differential
corrections haven't been received within the time limit you've
specified in the DGPS data time-out setting. To adjust this
setting, see "Choosing a DGPS corrections time-out" starting
on page 150.
957 Operator's Manual, Rev. B