Geonav 4 gipsy, User And Installation Manual

Page: 33 / 91

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English
Functional Characteristics
To activate or deactivate the Overzoom function, press
GOTO
to
display the menu bar, then select SETUP, OVERZOOM and
ON/OFF.
Position calibration
All position sensors have intrinsic errors that make the boat’s
position incorrect (from few meters to several hundred meters)
with respect to the background display of the chart.
This error is caused by the principle at the root of the satel-
lite-derived position system. The position calibration func-
tion allows correcting manually the position error present in
all GPS devices, provided that this error is not greater than 2
nautical miles.
To carry out the calibration, press GOTO to display the menu
bar and then, by the
CURSOR
key, select SETUP, CALIBRA-
TION and then ON. A message will prompt the user to move
the cursor to the boat’s true position, appropriately enlarged
by the
ZOOM+ key.
Press
ENTER
to move the boat’s position to the point indicated
by the cursor. This operation will save the calibration for use
in future calculations.
NOTE: When the calibration is activated, the coordinates will be marked by (*).
To cancel the calibration, press
GOTO
to display the menu bar,
select SETUP, CALIBRATION and then OFF.
Local time
By this function the user can enter local time instead of the
Greenwich time (GMT) supplied by the GPS receiver.
To enter local time, press
GOTO
to display the menu bar, select
SETUP, SET TIME and then LOCAL.
A window will allow entering local time by using the
CURSOR
key. Press
ENTER
to confirm the operation.
To cancel local time, press GOTO to display the menu bar, se-
lect SETUP, SET TIME and then GMT.