On hardware and sensors in detail:


As an introduction, many sensors (compass, speed, depth, temperature, wind) are now available as stand-alone NMEA devices, thus eliminating the need to make their readings visible on a display before their data is transmitted to other NMEA-listeners. This is major step ahead to develop custom-made system for a yacht with little or no dedicated displays, which seems to become the future of these systems. However not all units available allow the calibration on the unit itself, which should be a built-in feature on all units.

Heading/Compass Sensor (Digital Yacht HSC100). This unit sends data at high frequency (10 Hz), it may be calibrated and zero-ed to north with two simple buttons on the unit itself making it compatible to lot of other units and displays.

ACTISENSE NDC-4 Multiplexer:

The NDC-4 shares a number of highly useful features:
  • It delivers one single NMEA data set, useful when existing displays lack the capability to receive more than one data set/have only one gate.
  • It may integrate up to 5 NMEA talkers (but only 4 are used in our system)
  • It converts incoming NMEA 0183 data to NMEA V2.0 data by adding necessary NMEA checksums. This allows operation of the latest software packages. (Note, modern packages and apps for the iphone etc may not accept NMEA 0183 data < V2.0)
  • It allows to suppress redundant NMEA phrases, commonly sent by many NMEA talkers, which removes clutter and redundant information on the system and improves system speed
  • It allows for prioritization of NMEA talkers thus eliminating in part differences in transmission frequency of NMEA talkers installed
  • It allows to increase output speed from 4.800 up to 115 k baud thus it may integrate AIS data at 38.400 (Hi-speed NMEA 0183) baud easily.
  • It provides perfect opto-couplers to take away any electrical issues caused in the past by equipment not completely not programmed to the NMEA 0183 standard.

WIND Unit RO (LCJ Capteur CV3F Ultrasonic Sensor). These units are sturdy, motionless devices which show excellent linearity, probably better than any other mechanical device. Please note LCJ Capteurs now manufacture the CV7-C a unit better suited for sailing yachts. In addition these units are available without cable facilitating installation on mast-tops. They can be networked to most systems on the market and those of the past. Unfortunately they cannot be zero-ed on the unit/its little blackbox itself.

AIS (Trueheading RX Carbon). Trueheading are easy to install and to network. This unit particular model comes with a built-in antenna switch (no secondary aerial needed), all cables required and delivers data from an rs232 and USB port in parallel. Tts low power consumption may be satisfied by a regular USB port on the receiving equipment.

CETREK Depth Sensor incl. interface* (#930-379). This sensing equipment was made for high precision as it will tune ist frequency to depth detected, ie frequency will increase in shallow waters increasing its precision.

CETREK Speed/Temp Unit (AIRMAR ST650) (#930-365)

Garmin GPS 120*, a simple but not old 8-satellite GPS.

Move on to what displays are used in the system

* CETREK NET devices are out of production, so is the Garmin 120 GPS. We have some documentation like manuals for the units listed as well as on some CETREK 2000 models. Parts for these units and repairs may be available from TheServicecentre.eu This company will do repairs on nearly all marine electronics.