Raymarine GPS navigation User Manual download pdf (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 the[CLEARlkey 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

ARRlvAL

wAyw’NT

distance from your waypoint. The ar-

CIRCLE

’

rivalalarmcanbesetErom0.01 to9.99

l %@t%#E?rHEN

nautical miles (run).

I!3

,ARFUVAL CIRCLE

-b

To set an Arrival alarm:

Press

thel]key.

The SET NAV

ALARMS

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

theI-

softkey. 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;

Pres$KiZ$

press 0 , 1 , 0 ,

There are several factors which should be

con-

sidered

when setting the arrival alarm zone dis-

0 10

-‘--

ARRIVAL

tance.

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

000

OFF-COURSE4

-9

with the surroundings.

PRESS CLEAR TO EXIT

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

ft/hour, 3000 ft/minute, or

ft/sec., so an arrival alarm set to 0.0 lnm gives

you 1.2 seconds to react. If the alarm were set to 0.2nm, (1200 ft) you will

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

NAV

398

the arrival

OPERATION 3-27

..T_”

-1-.

1 ... 40 41 42 ... 75

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Raymarine GPS navigation User Manual Page 41

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