Navitron NT920RI

Rudder Indicator System

Navitron Rudder Angle Indicators (type NT920RAI) can be configured for single or multi head display as add on components to all Navitron autopilot types or as independent (stand alone) systems employing a dedicated Rudder Angle Transmitter Unit (NT920RTU).

All Indicator heads (NT920RAI) are electrically and mechanically identical (no master / slave distinction) which provides complete interchangeability and straightforward system expansion.

Each Indicator head comprises a robust centre zero moving coil driving an illuminated white pointer against a black scale background graduated in 5° increments. Provision is also made for fixed and variable intensity red backlight scale illumination for night viewing.

Standard RAI heads are suitable for wheelhouse (sheltered) panel mounting. External locations may be used (foot bracket or panel mount) when supplied with a Navitron Pod assembly (PM).

Engineered in Marine grade cast aluminium the NT990RTU is a robust stand alone rudder angle transmission unit which provides two isolated digital outputs and one non isolated analogue output for use by proprietary navigation computers and/or monitoring devices such as VDR/SVDR etc.

Suitable for direct connection to 11-40Vdc ships supply, the NT990RTU incorporates a high quality voltage regulated conductive plastic potentiometer and processor intelligent encoding to provide dual isolated NMEA outputs ($YXRSA sentence) with installation selectable 1Hz or 10Hz update and 4800 or 38,400 baud rates as required.

When mechanically coupled to the rudder stock / tiller arm, accurate rudder angle data is continuously transmitted to the receiving device.

Built in error management ensures that the NT990RTU detects illogical / fault conditions with resultant ‘Invalid Data’ transmissions if appropriate.