Surface Mounting - Without Access PCF OFFSET
If you don't have access to the back side of the mounting surface,
use
the "cleats" supplied with the AccuNav II. (Note: This is assuming you
can "snake" the module's cable to a location that is accessable. A hole
will still need to be drilled in the mounting surface for the cable.) Using
the gasket
as a
template, mark and drill the 17mm (11/16") hole for the
cable. Attach the cable
to the module and drop the other end of the
cable
through the gasket
and down the hole. Place the module on the
gasket. Slide the "cleats" onto each end of the module and (using the
cleats as templates) mark four holes for 5 mm (#10) mounting screws.
Drill
the
holes, then replace the cleats on the module and fasten them to
the mounting surface with 5 mm (#10) screws. Route the cable to the
AccuNav II.
The GPS
navigation system relies on complex
mathematical calculations
to determine your position based on satellite data and other factors. One
factor is the Earth's shape. Since the Earth
is
not
a
true
sphere,
variations
in the calculations have to be made to accommodate deviations. To make
matters more
complex, not everyone uses the same data to determine
what the deviations are. The size and shape of the
ellipsoids
that are used
to approximate the earth's surface are improved often. This can lead to
errors if
your navigation device uses one ellipsoid,
while
your chart uses
a different one. The term used for these
ellipsoids is "Datum."
To reduce the errorfactor between datum,
this unit
gives you
the
capability
to move or "offset" the
position shown on the
display
to
match the one on
the
chart. The unit will add this
offset to all position displays at all times.
Remember, the UPS error is very dynamic and the PCF
offset should
never be used in an attempt to cancel the error. In general terms this
feature should only be used if
your map indicates what the possible error
is. This feature should
always be reset to zero (0)
when finished with that
chart.
For example, suppose you are stopped at a location that is accurately
marked on a chart. Your unit shows a longitude position that is .010
degrees less than the one on the chart. Using the Positipn Correction
Factor (PCF) Offset
feature, you make the unit read the same as the
chart.
If you move, the unit will continuously add the change to all position
displays.
This makes it more closely
match the datum used by
the
chart.
For this reason, you
should be careful when
entering
the PCF offset. This
offset is saved in memory. It doesn't change when the unit is turned off.
However, a Preset does erase the PCF factor.
To set the PCF
factor,
first
press the MENU key,
then press the
key
next
to the "CHANGE GPS SET-
Position Correct ioid TINGS" label. Now press the
Factor key
next to the "ADJUST FCF
______________ OFFSET" label. The screen
______________ shown below appears.
Now
press the key adjacent to
the "CHANGE
OFFSET" label
to enterthe correction factorfor
your location. The screen
shown at the top of the next
page appears. Remember,
this
'CLEAT"
MARK AND
DRILL FOUR
PLACES
GPS
GASKET
CABLE
LAT OFFSET:
LON OFFSET: IIJ.tAUJ.UJ.U
E 0°OO.000'
4 41
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