Memorex RX 1 Smart Installationshandbuch PDF herunterladen (Seite 29)

Keypad & Display Description | 27

data to calculate your speed parallel to wind and can output the VPW NMEA 0183 data

sentence to other on-board instruments.

The window below the wind data provides information relating to your course and speed.

You will find the Course Over Ground (COG calculated by the MX421 smart GPS antenna),

Heading (HDG, your NMEA 0183 compass input), and Heading To Steer (HTS) data on

the left side of the window. HTS data is calculated by considering your Heading, minus

COG and adding BRG to the waypoint. In doing so, the software considers any Set to be

included in the HDG value. If there is no Set, your HDG should be equal to COG. Set

and Drift is calculated from GPS and your Speed Log (NMEA 0183 VHW record or Pulse

input) and Compass (NMEA 0183 HDM, HDT, or VHW) input or an operator manual input.

On the right side of the lower left window you will find the Speed Over Ground (SOG,

calculated by MX421 smart GPS antenna), Speed Log (LOG, the NMEA 0183 or pulse

speed input), and the Waypoint Closure Velocity (WCV). WCV reflects the real time

velocity from your present position and course towards the next waypoint. The VMG

and WCV are calculated from GPS data. Refer to the diagram below to see a graphical

representation between VMG and WCV.

Present

Position

SOG 13 Kn

Beginning

Waypoint

Original Course Line

Actual

Course

Line

VMG

Towards

Waypoint

BRG

Effect of

Set & Drift

6297_01B.100

Present

Position

SOG 13 Kn

WCV 9 Kn

Beginning

Waypoint

Original Course Line

BRG

RNG

Extended

Course

Line

WCV is based on

Extended Course

Line (COG), SOG,

BRG & RNG to WPT

Effect of Set & Drift

HTS to

counter

Set & Drift

Velocity Made Good:

Distance to

Waypoint Travelled

Waypoint Closure Velocity:

Below this information, you will find your Set and Drift data, which is calculated using GPS

and your compass and speed sensor inputs.

Reset XTE and Skip Waypoint, described at the end of NAV2, is also available in NAV4.

The window on the right displays depth information coming from the depth sounder unit

using the NMEA 0183 record of DPT, DBS, DBT, or DBK. These are setup in the CFG1

Depth screen, refer to the Configuration section of this manual for full details on depth

data.

Below the depth data you will find the next route leg vector, the Range to the waypoint

and Time To Go data, explained in the NAV3 section.

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