Raymarine GPS navigation - Manual (Page 72)

4.3 Replacing The Battery
Both the
NAV 398 and the GPS sensor units contain internal
memories to store your position and other set-up information. A lithium
back-up battery keeps this memory information intact even when the units
are disconnected from the ship’s battery.
The estimated life span of the internal memory battery is from three to five
years. If a battery should fail, the memory contents will be lost.
While both the
NAV
398 and 108 GPS sensor can be operated
without their batteries, the 298 would not retain its memory, and
the 108 would require a time consuming cold start-up each time
you use the units. This would be extremely inconvenient. To insure
operation, it is recommended that the battery be replaced every three
years with an exact replacement lithium battery by your Authorized
Raytheon dealer or by the Raytheon Factory Service Center.
4.4 Master Reset
The NAV 398 unit is a microprocessor based equipment, and like most
computers, it runs smoothly and efficiently in normal use. However, under
extremely rare conditions, (for example: during very low and intermittent
DC input power conditions, such as while starting engines) the unit could
“hang up” or “freeze”. If this condition should occur, re-boot the
NAV 398
with a Master Reset when the DC power condition has been normalized.
There are two types of Master Resets available:
l
Hard Reset Clears all memories and resets the unit to the
default settings.
l
Soft Reset Only resets the default settings, but does not effect the
memories.
Typical Default Settings:
Latitude Direction = North
Magnetic Variation = On
Averaging L/L = Med
Display Mode =
Backlighting = Off
Longitude Direction = West
Position Corrections = Off
Units =
Arrival Alarm = 0.10 nm
Other Alarms = 0.00 nm
Hard reset only:
Memories 0 Route Plan Memories = 0
WPT Destination = 00 (No XTE or digits)
MAINTENANCE 4-2