Raymarine GPS navigation User Manual

Page 41

3.7 Setting Alarms

The

NAV

398 has three operator programmable alarms that you can set to

advise you when limits have been reached. The types of alarms available

are:

ARRIVAL- Arrival at a waypoint.

ANCHOR Exceeds Anchor drift limit.

OFF COURSE- Straying too far from track.

Whenever an alarm is set and activated, the audible beeper will sound and

the alarm characters will blink on-screen. You can set an Arrival alarm or
Anchor alarm, but not both types together. Press

to silence

the audio alarm.

3.7.1 The Arrival Alarm

The Arrival alarm can be set to alert

you when you are within a specified

distance from your waypoint. The ar-

CIRCLE

rivalalarmcanbesetErom0.01 to9.99

nautical miles (run).

CIRCLE

To set an Arrival alarm:
Press

The

SET NAV

ALARMS

screen appears. This is the alarm set-up screen. Press

Then enter the distance value for the desired arrival alarm zone with

the numeric keys. Press-to finish the entry and exit back to the last
used display mode.

Example: To set an Arrival zone of 0.06 nautical

SET NAVALARMS

miles;

press 0 , 1 , 0 ,

There are several factors which should be

when setting the arrival alarm zone dis-

0 10

ARRIVAL

Among these factors are: the speed your

ANCHOR

vessel is or will be traveling, the weather condi-
tions (foggy, rain, clear, etc.), and your familiarity

0 0 0

with the surroundings.

CLEAR TO EXIT

A vessel traveling at 30 knots, will travel 180,000

3000

so an arrival alarm set to 0.0 lnm gives

you 1.2 seconds to react. If the alarm were set to

(1200

you will

have 24 seconds to decide your course of action. In the

NAV

the arrival

OPERATION 3-27