15-2
Contents
1. Introduction
2. Regulations
3. Marking of the two devices
4. SAL T2+ illustration
5. Electrical power supply
1. Introduction
This section explains how to fulfil the needs for a normal electrical installation of a SAL T2+JLN-
900 Speed Log system.
2. Regulations
A complete JLN-900 Speed Log system consists of two separate speed log devices for
measuring STW (Speed Through Water) and SOG (Speed Over Ground). The two devices
are named “JLN-900 Speed Log STW DEVICE” and “JLN-900 Speed Log SOG DEVICE”.
The JLN-900 Speed Log system fulfils the MSC.334(90) regulation requirement of two
separate speed logs.
Two NWW-82 displays, one for each device, are mandatory equipment. Both displays are
able to show information from both devices simultaneously, since information is shared
between the devices. Therefore, the NWW-82display belonging to the STW device is also
able to show SOG, and the NWW-82display belonging to the SOG device is also able to
show STW. This redundancy coupling is illustrated on page 4.
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