Information On Sensor Inputs To The System; Compass Input; Log Input; Position Input - Sperry Marine Visionmaster FT ECDIS User Manual

ECDIS User Guide Overview

Information on Sensor Inputs to the System

The VisionMaster Radar system is Type Approved using 19", 23.1" and
25.5" displays with X-Band and S-Band top units. To function correctly the
system requires sensor input from external devices. Any limitations
associated with the method of sensor input are stated below.

Compass Input

The approved method of compass input is via an analogue input, either
through a Synchro or Stepper motor interface. If an analogue input is
unavailable then a serial input may be used with data conforming to IEC
61162-2 at 38400 baud rate and a message update rate of approximately
50Hz.
The primary compass data should be used in all circumstances. For
example, re-constituting serial data as analogue data via a converter is
inferior to using the serial data direct.

Log Input

The speed log input used must be compliant to IMO resolution A 824(19).
When a ground speed log is in use, true video trails will be ground
stabilised, using both longitudinal and transverse data if available from the
log. However, a ground speed log may have inaccuracies in deep waters,
depending on the actual depth of the sea. Additionally, if a single axis log
is used it will not take into account transverse effects due to leeway, tides
and currents. The magnitude of these effects will depend on their strength
and direction.
When a water speed log is in use, true video trails will be water stabilised,
using both longitudinal and transverse data if available from the log.

Position Input

The EFPS connected to the system must be compliant with IMO
resolution MSC112(73) or MSC.114(73).
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