Navigation Flashcards
(24 cards)
What is the function of the navigation system?
Navigate safely
Collision avoidance
Determine position/velocity information
What does the navigation system comprise of?
NADS
WECDIS
MARINS
OCTANS
Pelorus
GPS
AGILOG2
Draw the equipment diagram for the navigation system
Pg 122 TWS TAB
Where is NADS software run?
SCEs
Where are the NPUs located?
NPU A - SCAB A
NPU B - SCAB B
What is the function of WECDIS?
Plot and manage data transferred from other combat system equipment
Record own ship data
Calculate own ship position
How and where is WECDIS software run?
Virtual machine running on MFCs (RHS)
Where is the WECDIS laptop connected to?
Either in the Shared Cab or in the bridge to the NPU SAP with GPS dongle
What is the function of MARINS?
Provides heading, pitch and roll data via 2 independent units
How does MARINS work?
Fibre Optic Gyroscope technology
What is the backup for MARINS?
OCTANS for heading and depth data
How does OCTANS work?
Sagnac effect which used rotation to output heading and depth information
How does MARINS interface with the combat system?
Via the NPUs in the SCABs
How does MARINS get O/S speed?
EM Log
How is configuration and control of MARINS achieved?
MARINS webpage on the MFCs
What does OCTANS provide data on?
True heading
Roll/pitch
Yaw
What does OCTANS contain?
3 accelerometers
3 fibre optic gyroscopes
Real time computer
How is configuration and management of OCTANS achieved?
Web server interface, connect the maintainers laptop directly to the Ethernet port on OCTANS
How long is alignment on OCTANS?
5 minute initial alignment for north and vertical axis. Heading and attitude data available but not accurate
5 minute long alignment phase to provide accurate data
What is GPS and how does it link to the combat system?
Satellite based Global Positioning System
Communicates via the External Communication System (ECS) when surfaced or at PD
What is the function of AGILOG2?
Provides speed and distance travelled through water
What makes up the AGILOG2 system?
2 outboard probes (keel)
Probe selection box
2 Speed and Distance Transmission Units (SDTUs)
What is Pelorus?
Compass mounted in the Bridge Fin, consisting of a gimbal mounted bowl on a mounting bracket
Indicates O/S heading
What is AIS?
Automatic Identification System used for collision avoidance IAW Safety of Life at Sea (SOLAS)
Receive only on SM, with RF signals provided by VHF external comms
