Simrad NX45 Specifications download pdf (Page 83)

Simrad NX40/45 Installation and Operation Manual 83

and cartographic features such

as land, rocks, buoys and depth

contours.

Use Map datum to select the unit

map datum to match the datum of

the paper chart. Then, the latitude

and longitude coordinates of objects

shown on the unit will change to

match the corresponding coordinates

on the paper chart.

Setting map datum

In the Chart setup menu >

Map datum > Select the map

datum for the paper chart you are using.

If you select a datum other than

WGS 84 the unit asks if you want to

apply the NMEA datum offset (see

below).

NMEA datum offset If you select a map datum

other than WGS 84, the map datum

offset can be applied to latitude and

longitude coordinates sent on the

unit’s NMEA output:

Latitude and longitude coordinates

shown on any NMEA repeater do not

match the coordinates on the unit.

Latitude and longitude coordinates

broadcast on any NMEA VHF

transmitter will be the same as the

coordinates on a WGS 84 chart.

Latitude and longitude coordinates

shown on any NMEA repeaters match

the coordinates on the unit. However,

latitude and longitude coordinates

broadcast on any NMEA VHF

transmitter will be slightly offset from

coordinates on a WGS 84 chart.

Map shift Some charts have consistent position

errors. To correct this, apply a map

shift.

After a map shift:

The positions of cartographic features

(such as land, rocks, buoys and depth

contours) move on the chart window

to where they should be.

The positions of the boat, waypoints,

tracks, and lines of latitude and

longitude on the unit chart window

remain unchanged.

CAUTION

!

!

CAUTION

DANGER

WARNING

Map shift is for eliminating

minor offsets. It should

not be used if the correct

datum is available. Use

map shift with caution:

incorrect application will

cause incorrect boat

positions.

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