SPERRY NAVITWIN IV

NAVITWIN IV is Sperry Marine’s central, all-embracing multiple heading reference management system. It displays and monitors a minimum of 2 and a maximum of 4 heading sources (3 gyrocompass/THD headings and 1 magnetic heading) from the following Sperry Marine range of heading sensors:

• NAVIGAT 2100 Fiber-Optic Gyrocompass
• NAVIGAT X MK 1 Digital Gyrocompass
• NAVIGAT X MK 2 Digital Gyrocompass
• NAVISTAR Satellite Compass (THD)
• Jupiter magnetic compass (with flux gate)

Main Features

• Monitors and controls all heading sources of a multicompass heading reference system.
• Displays up to three gyrocompass/THD headings and one magnetic compass heading.
• Shows the current heading from all available heading sources on a color TFT LCD (thin film transistor liquid crystal display) and allows the operator to select from these an active heading source for distribution to subscribers such as repeaters, autopilots, radars, ECDIS, etc.
• Monitors the difference between any two of the displayed headings. If the difference between the two headings exceeds a user-defined preset threshold, an audible and visual “Heading Difference Alarm” is actuated.
• Monitors the difference between the heading from the active heading source and the set heading (course to steer) on the autopilot. If the difference between the two headings exceeds a user-defined preset threshold, an audible and visual “Off Heading Alarm” is actuated.
• Accepts an automatic set heading input from an autopilot or a manual input.
• Reads the sine and cosine analogue signals from a Sperry Marine magnetic compass flux gate and converts these into magnetic heading data in NMEA format.
• Provides automatic correction for magnetic variation and deviation.
• NAVITWIN IV has been type approved to EC Council Directive 96/98/EC by BSH.

Displays

The following data can be displayed on the TFT LCD:

• Gyro 1 heading
• Gyro 2 heading
• Gyro 3 heading
• Magnetic compass heading
• Speed, manual or auto (when provided)
• Position in lat. and lon. (when provided)
• Date and time, manual or auto (when provided)
• Alarms
• Heading difference alarm threshold
• Off heading alarm threshold
• North speed error correction

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