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1. OPERATIONAL OVERVIEW
1-2
1.2 Turning On and Off the
Power
The GP-150-DUAL takes about 90 seconds
to find its position when turned on for the very
first time. Other times it takes about 12
seconds.
Note: The GPS provides highly accurate
position information. However, position
should always be checked against
other aids to navigation to confirm
reliability, for the safety of vessel and
crew.
Turning on the power
Press the POWER key.
The unit tests the PROGRAM MEMORY,
SRAM and battery for proper operation and
shows the results on the display. If equipped
with the internal beacon receiver, "BEACON
RCVR INSTALLED" appears at the bottom of
the display. After the test has been completed,
the unit starts up with the last-used display
mode.
PROGRAM MEMORY = OK
SRAM = OK
Internal Battery = OK
234°
345°
D3D 100m
SAFE
34° 23.456´ N 135° 45.678´ E
BRG
RNG
123
12.3
SOG
kt
COG
[01]
30
40
20
50
H
2nm
BEACON RCVR INSTALLED
DATA 3 : DATA OUTPUT
GPS receiving
condition
Several seconds
later
WGS84
nm
Figure 1-2 Appearance of display when
turning on the power
When turning on the power the following
occurs:
12 seconds after turning on the power,
accurate position (in latitude and longitude)
appears on the display.
If position could not be found, "NO FIX"
appears at the GPS receiving condition
window. When PDOP (Position Dilution Of
Precision) value exceeds 6 in the 3D mode or
HDOP (Horizontal Dilution Of Precision)
value exceeds 4 in the 2D mode, "DOP"
appears to indicate abnormal fixing and the
position indication is not updated.
When the satellite signal is being received
normally, one of the indications shown in
Table 1-1 appears depending on equipment
setting and GPS receiver state.
Table 1-1 GPS receiver indication
Indication Meaning
2D GPS 2D
3D GPS 3D
D2D Differential 2D
D3D Differential 3D
W2D WAAS 2D
W3D WAAS 3D
Note 1: When PDOP value exceeds 6 in the
3D mode, the position fixing method
is automatically changed to 2D.
Note 2: The "DEMO" icon appears when the
display is in the demonstration mode.
To return to the normal mode, turn
off the power and turn it on while
pressing and holding down the
NU/CU ENT key.
Turning off the power
Press the POWER key.
The next time you turn on the power the unit
starts up with the last-used display mode.