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Velocity instrument

 
Velocity instrument

Operation

 
After clicking the "Start" button the simulation will start, and NMEA sentences will be sent to the selected output port of the PC, until the "Stop" button is pressed. Note that only those NMEA sentences will be sent that are checked in the "NMEA sentences" panel.
 
All sentences are shown in the I/O Port Monitor as they are output. When logging is ON (toolbar option), the sentences will also be written to the user selected log file.
 
Clicking the "Stop" button will suspend the operation, until "Start" is clicked again.
 
When the Transmit Interval is set to 0.0 the sentences are output as "single shot" each time you click the "Start" button.
 
Clicking the little X top-right will exit the object and save optionally all current values, so that next time the instrument is used it can continue where it stopped. Note: saving is an optional setting in the General Settings.
 
A short description of each field follows.
 
 
 
1

Object Tag

1. Object Tag
Optional, to give this instrument a name for easy identification.
2

Water speed offset

2. Water speed offset
Set the offset between the speed through water and the speed over ground.
This setting has impact on the Water speed and the Ground speed Longitudinal controls.
3

Water speed

3. Water speed
The longitudinal and lateral speed through the water.
Set the validity for the VBW sentence with the Data Valid control:
  • A = Data Valid,
  • V = Data Invalid
4

Ground speed

4. Ground speed
The longitudinal and lateral speed over ground.
Set the validity for the VBW sentence with the Data Valid control:
  • A = Data Valid,
  • V = Data Invalid
5

Stern Transverse Speed

5. Stern Transverse Speed
The longitudinal and lateral speed over ground and through the water of the stern of the ship when turning.
Set the validity for the VBW sentence with the Data Valid control:
  • A = Data Valid,
  • V = Data Invalid
6

Distance travelled

6. Distance travelled
Distance travelled, reflected in the VLW sentence.
The values are automatically adjusted based on ground speed during the simulation.
Reset to 0.0 with the Reset buttons.
7

Sentence Identifier

7. Sentence Identifier
To set the NMEA0183 sentence identifier. Set this to either
 
  • $II - Integrated Instrument
  • Native - $VW and $VD
  • Proprietary - create your own in the text box
8

Sentence Formatters

8. Sentence Formatters
Select the NMEA 0183 sentences you want to simulate and to be sent to the output port
9

Checksum

9. Checksum
Check this if you want a checksum added to each sentence
10

Link to Heading instrument

10. Link to Heading instrument
Optional link to any active Heading object. Valid for VHW sentence.