Purpose
1 The purpose of this Guidance is to enhance the safety and efficiency of
navigation and communication equipment intended for use on ships operating in polar
waters:
-
.1 It gives recommendations on general requirements and specific
performance standards for navigation and communication equipment
intended for use on ships operating in polar waters.
-
.2 It covers:
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.1 generally, all navigation and communication equipment
where equipment or parts of it are exposed to the specific
environmental conditions of the polar waters; and
-
.2 specific requirements for equipment which may be
influenced by regional effects.
-
.3 It aims to establish requirements to facilitate different approaches
(e.g. built-in protection, handling requirements, etc.).
Scope
2 This Guidance provides recommendations on:
-
.1 requirements for navigation and communication equipment intended for
use on ships operating in polar waters, where technical provisions could
reduce the listed effects;
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.2 rules to operate navigation and communication equipment intended for
use on ships operating in polar waters, if technical provisions could
not protect the equipment from the listed effects; and
-
.3 additional requirements for navigation and communication equipment
intended for use on ships operating in polar waters, if the equipment is
influenced by incorrect data of impaired equipment only.
Structure
3 This Guidance has a modular structure:
-
.1 It starts with a general part (Module A) which should be applied to
equipment or parts of it exposed to the environmental conditions of
polar waters.
-
.2 The second module (Module B) is addressing equipment specific topics.
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.3 The third module (Module C) is addressing the handling of incorrect
data of impaired equipment.
-
.4 The appendix provides information on survival craft and rescue boat
communications capabilities.
Application
4 This Guidance is applicable to navigation and communication equipment intended for
use on ships operating in polar waters.
Abbreviations
AIS
|
-
|
Automatic
Identification System
|
DSC
|
-
|
Digital
Selective Calling
|
ECDIS
|
-
|
Electronic
Chart Display and Information System
|
EGC
|
-
|
Enhanced
Group Call
|
ENC
|
-
|
Electronic
Navigational Chart
|
GNSS
|
-
|
Global
Navigation Satellite System
|
HF
|
-
|
High
Frequency
|
LRIT
|
-
|
Long Range
Identification and Tracking
|
MF
|
-
|
Medium
Frequency
|
PST
|
-
|
Polar Service Temperature (defined by Polar Code, part I-A,
paragraph 1.2.11)
|
PWOM
|
-
|
Polar Water
Operational Manual
|
SART
|
-
|
Search and
Rescue Radar Transponder
|
SOLAS
|
-
|
International
Convention for the Safety of Life at Sea
|
THD
|
-
|
Transmitting
Heading Device
|
VDR
|
-
|
Voyage Data
Recorder
|
VHF
|
-
|
Very High
Frequency
|
MODULE A – GENERAL PART RELATED TO EQUIPMENT EXPOSED TO THE SPECIFIC
ENVIRONMENTAL CONDITIONS OF POLAR WATERS
Generally, limitations due to environmental conditions should be documented in the
Polar Water Operational Manual (PWOM).
A.1 Temperature
A.1.1 If equipment or parts thereof are exposed to the environmental conditions of
polar waters, the navigation and communication equipment should keep its specific
performance requirements as far as possible.
A.1.2 Exposed portable equipment should be subject to testing in accordance with a
recognized procedure,footnote except that the temperature of the chamber should be
reduced to, and maintained at, the specified PST.
A.1.3 In addition, test condition provisions in paragraphs not related to
exposure temperature should follow the General requirements for shipborne radio
equipment forming part of the Global Maritime Distress and Safety System (GMDSS)
and for electronic navigational aids (resolution A.694(17)).
A.2 Ice accretion
A.2.1 If equipment or parts thereof are exposed to ice accretion, dependent on the
polar water and season, the navigation and communication equipment should keep its
specific performance requirements, as far as possible.
A.2.2 According to the Polar Code, part I-A, paragraph 4.3.1.1.1, the icing allowance
as stability criterion is 30 kg/m² (around 30 mm) on horizontal parts or 7.5 kg/m²
(around 7.5 mm) on vertical parts and should be used as maximum criterion for icing
for the ship and related navigation and communication equipment exposed to icing
with respect to its design and placement on board.
A.2.3 The performance could be ensured by:
-
.1 physical protection (e.g. heating);
-
.2 operational protection (e.g. removing); or
-
.3 design (e.g. location can be easily accessed for removing of ice or
the design reduces possible covering of ice).
A.2.4 Where facilities to de-ice equipment are provided, these should result in the
performance criteria being met within two hours from power on.
A.2.5 According to the Polar Code, the physical and operational measures should be
part of the PWOM.
A.3 Handling of equipment dependent on batteries
A.3.1 According to the Polar Code, part I-A, paragraph 1.2.7, the maximum expected
time of rescue means the time adopted for the design of equipment and system that
provide survival support. It should never be less than five days (120 h). This
requirement may be difficult to meet by some specific equipment requirements, design
requirements or handling requirements.
A.3.2 Based on the interpretation provided in the appendix, the performance of
equipment and systems that provide survival support may be maintained throughout the
maximum expected time of rescue using design requirements, operational requirements
and any other means documented in the PWOM or a combination of these.
A.3.3 Any procedures or measures taken to address ice accretion or the handling of
equipment dependent on batteries, as outlined in sections A.2 and A.3 respectively,
should be included in the PWOM.
MODULE B – REQUIREMENTS FOR SPECIFIC EQUIPMENT
B.1 Magnetic compass
B.1.1 If the magnetic compass is intended for use in polar waters, the
performance in latitudes beyond 70 should be additionally validated with the
requirements of resolution A.382(X) on Magnetic Compasses – Carriage and
performance standards.
B.1.2 The magnetic compass fitted on deck without tarpaulin should be protected
against ice accretion as described in section A.2, if it is intended for use in
specified latitudes during the relevant trip within polar waters.
B.2 Pelorus, compass bearing device or heading repeater (gyro, magnetic or
GNSS-THD compass)
If the related compass device is intended for use in polar waters and exposed to the
weather, the pelorus or compass bearing device including their means of correction
should be protected against ice accretion as described in section A.2.
B.3 ECDIS
The ECDIS should be capable of displaying ENCs in a projection suitable for higher
latitudes, as applicable, for the intended route. Input data of critical input
sensors should be handled as described in module C.
B.4 GNSS-receiver
The GNSS-antenna should be protected against ice accretion as described in section
A.2.
B.5 Radar reflector
The radar reflector should be protected against ice accretion as described in section
A.2.
B.6 Sound reception system
The outdoor microphones of the sound reception system should be protected against ice
accretion as described in section A.2.
B.7 Daylight signalling lamp (if fitted on deck)
The daylight signalling lamp (if fitted on deck) should be protected
against ice accretion as described in section A.2.
B.8 Radar
The radar antenna should be protected against ice accretion as described in section
A.2. Input data of critical input sensors should be handled as described in module
C.
B.9 Speed and distance measuring equipment
If underwater sensors are used for measuring speed through water, the
performance in very clean water conditions with a significant reduced number of
particles in the water, as expected in polar waters, should be validated to be
within the requirements of the Performance standards for devices to indicate
speed and distance (resolution A.824(19)).
B.10 GNSS-THD
The GNSS-THD antenna should be protected against ice accretion as
described in section A.2. The performance in latitudes beyond 70° should be
additionally validated to be within the requirements of the Performance standards
for marine transmitting heading devices (THDs) (resolution MSC.116(73)).
B.11 AIS
The AIS antennas should be protected against ice accretion as described in section
A.2. Input data of critical input sensors should be handled as described in module
C.
B.12 Gyro compass
If the gyro compass is intended for use in polar waters, the performance
in latitudes beyond 70° should be additionally validated to be within the
requirements of the Performance standards for gyro compasses (resolution
A.424(XI)).
B.13 Heading or track control system
Input data of critical input sensors should be handled as described in module C.
B.14 LRIT
The function may be limited depending on latitude and selected system (Inmarsat C is
limited whereas Iridium may offer a full coverage). The LRIT antennas should be
protected against ice accretion as described in section A.2.
B.15 VDR (if fitted on deck)
The float-free release mechanism of the VDR fitted on deck should be protected
against ice accretion as described in section A.2.
B.16 Navigation bridge visibility
The navigation bridge windows should be protected against ice accretion as described
in section A.2.
B.17 Pilot ladder
The pilot ladder should be protected against ice accretion as described in section
A.2.
B.18 Antennas for all radiocommunication equipment
The antennas for radiocommunication equipment should be protected against ice
accretion as described in section A.2.
B.19 EGC receiver
The function may be limited, in the case of Inmarsat EGC, depending on latitude. The
EGC receiver antennas should be protected against ice accretion as described in
section A.2.
B.20 EPIRB
The EPIRB should be protected against ice accretion as described in section A.2.
B.21 Two-way VHF radiophones for use in survival crafts
Two-way VHF radiophones for use in survival crafts should be included in the PWOM.
B.22 Navigation lights/360° Search light
The navigation and search lights should be protected against ice accretion as
described in section A.2.
B.23 Sound signalling equipment
The sound signalling equipment should be protected against ice accretion as described
in section A.2.
B.24 Search and rescue locating device (SART/AIS-SART)
The SART / AIS-SART should be protected against ice accretion as described in
section A.2.
MODULE C – HANDLING OF INCORRECT DATA
Depending on the region (latitude) some sensors (e.g. heading, speed) may not work
with the accuracy defined in the relevant standards. There should be an automatic
warning or a clear indication that the bridge crew is able to decide to use the
information for display or for use in any other calculation of connected
equipment.