Simrad AP28 Technical Information download pdf (Page 119)

Glossary | 117

SimNet Class 1 products – Simrad products that are

SimNet controllers, i.e. they have an appropriate display

and routines that can set up and control the SimNet.

SimNet Class 2 products – Simrad products that do not

contain a SimNet controller. When connected to SimNet

they will automatically pick the first available source on

SimNet and lock onto that. When a Class 1 product is

added to the Simrad Group, Class 2 products will

automatically subordinate themselves to the Class 1

source selection.

SimNet Group – A number of Simrad products that are

selecting and sharing the same data sources via the

SimNet network.

SimNet Source – Any product or device directly

connected to SimNet or NMEA2000, or interfaced to

SimNet via NMEA0183 or Robnet2.

SOG - Speed over ground is the actual speed of the

vessel relative to the ocean floor.

True bearing – Bearing relative to true north; compass

bearing corrected for compass error.

True heading – Heading relative to true north (the

meridian).

VMG – Velocity Made Good. A vessel’s true progress

towards a waypoint taken into consideration all factors

like leeway and current.

Waypoint - A discrete point, stored in a navigator,

located on the surface of the earth. Normally this point

will be identified by Lat/Lon coordinates although in some

systems it may be shown by T.D.'s.

XTE - Cross Track Error - Used to identify a vessel’s

position relative to a straight line drawn between two

waypoints. The amount the vessel is off to the left or to

the right of this line is known as the Cross Track Error. It

is normally displayed in thousands of a nautical mile,

equal to 6 ft or 1.85 m.

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Simrad AP28 Technical Information Page 119