Raymarine HSB Chartplotter User Manual - Units

Chapter 5: Setting Up the Chartplotter

87

This setting does not affect the default soft key labels, which are

controlled by the Soft Keys option previously described.

Units

You can set the units for distance, speed, depth and temperature. The

units you set will be used to display all data, including information

received from other instruments on the system. However, the distance

units do not affect the chart scale, which is always in nautical miles.

Variation Source

The variation value is the difference between True and Magnetic

direction data for heading or bearing values. The Variation Source option

provides soft keys for selecting Auto or Manual variation mode, displays

the current variation value for each and highlights the currently selected

mode.

Auto Mode

If you select Auto mode, the chartplotter obtains the value of variation

automatically, normally from received SeaTalk or NMEA data. The

variation value that is used depends on the data available, and is

selected in the following order of priority:

1. Variation value from the same source as the heading data:

-

If heading data is being taken from NMEA, then variation is also

taken from NMEA

-

If heading is taken from SeaTalk, then SeaTalk variation is used

2. Variation value from a different source:

-

If heading data is being taken from NMEA, but no NMEA

variation is available, then variation is taken from SeaTalk

-

If heading is taken from SeaTalk, but no SeaTalk variation is

available, then variation is taken from NMEA

3. A calculated variation value, using position data, if no SeaTalk or

NMEA value is available

4. The current manual variation value, if no SeaTalk or NMEA value

and no position data is available

System

Parameters