Manual Lowrance LMS-350A (page 89 of 93) (English)

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PCF OFFSET

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 error factor 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.

For example, suppose you are anchored 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 Position Correction

Factor (PCF) Offset feature, you make the unit read the same as the chart.

If you raise anchor and 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 Settings" label.

Now press the key next to the

"PCF Offset" label. The screen

shown at right appears.

Now press the key adjacent to

the "Change Offset" label to

enter the correction factor for

your location. The screen

shown at the top of the next page appears. Remember, this is the

difference between the location shown on the present position display and

the position shown on the chart.

Use the arrow keys to move the black box to the number that you wish to

change in the latitude, then enter the numbers. Press the key next to the

"Latitude N S" to change the latitude from north to south, if necessary.

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Lowrance LMS-350A Manual

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