Revision as of 14:14, 15 September 2016 by Briana (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Navigation Services
a place to discuss and follow the work

Knowledgeable WG members: Stefan Engström (FI), Dave Lewald (US Coast Guard)

The following is based on the test dataset, Jussland

Aids to Navigation (AtoN)

but IALA has S-201 Aids to Navigation Information - so what does this add?

  • Most features also found in S-101
    • What data to include in S-125?
    • Technical/additional data not in the ENC
    • Is S-125 a list of lights?
  • Additional objects/features that should be added to S-125?
  • What information is needed in S-125?
    • By the mariner / by others / intended end-use ?
    • Part of S-101 ECDIS or standalone?
      • Most positions already in S-101 (not all)
    • Type of station, and relaying data (affects range)
    • Location of base stations sending V-AIS (S-123 ?)
    • Reporting mode of station
    • Service details, ASM message types, pos. offset trigger details


The support or structure of any equipment is normally the physical structure upon which equipment is placed. Usually the same support is shared among different equipment. For all physical equipment, positions given are for the support. Exceptions are made for virtual equipment, where the virtual position is more significant for navigation.


Lights include navigationally important or interesting lights with the characteristics of conventional navigational lights as described in S-12.

IALA-GUID Station Name Position Character Height Range Daymark Additional
JU-A2N-00001 Mickleden 32° 31,00’S 61° 06,86’E Fl.5s 12m 22M xxx Sound, AIS, Racon
JU-A2N-00003 East yard, No 3 Basin 32°30.60´S 61°03.90´E Horn(1)30s 8m 12M xxx This is a bright Strip Light, 6m wide

Strip Light

A low intensity light, usually used in addition to a painted line. The light can be several meters long, and placed either horizontally or vertically. The Strip light might have a rhythmic light character and colored light. Usual use is to mark pier heads, quay walls and other structures. Due to low efficiency and range of the light, on nautical charts the flare symbol is not used for charting strip lights.

Lite Pipe

The lite pipe is a system of LED- diodes in a pipe, forming a highly efficient strip light. Lite pipe length can be 2-6 meters, and range up to 22M. Although being similar to a conventional strip light, the long range makes this light navigationally more interesting. This light will seem like a conventional light at long distance, and show up as a bright strip light at closer range. Lite pipes® can be used as emergency- and backup lights in lighthouses.

IALA-GUID Name Position Character Height Type/Range Daymark Additional
East yard, No 2 Basin 32° 36,50’S 60° 49,60’E Iso 8m Horizontal light 6 m wide Horizontal painted line, 6 m wide xxx
JU-A2N-00003 East yard, No 3 Basin 32°30.60´S 61°03.90´E Horn(1)30s 8m Horizontal light 6 m wide, range 12M Horizontal painted line, 6 m wide Lite Pipe

Sound Signals

Sound signals include conventional sound signaling equipment.

IALA-GUID Station Name Position Character Height Range Daymark Additional
JU-A2N-00003 Mickleden 32° 31,00’S 61° 06,86’E Siren(2) 30s Whistle 12m 22M xxx Light, AIS, Racon
JU-A2N-00004 Mickledore 1 32°30.60´S 61°03.90´E Horn(1)30s 43m 18/12M xxx Light, AIS

TABLE QUESTION: why not have Siren and Horn be listed under separate column as 'Type', like in Strip Light?


Conventional Racon usually triggered by and displayed on either or both of the below bandwidths. The different bandwidths are usually known as either;

  • X-band = 3 cm = 9 GHz
  • S-band = 10 cm = 3 GHz.
Station Name Position Symbol Frequency Sector Range Remarks
Mickleden 32° 31,00’S 61° 06,86’E G 3 Ghz 9 Ghz 0-360 15M xxx

Manually Activated AtoN

Manually activated aids to navigation include Lights and fog signals, which are activated by radio. Activation process might be "automatic" by f.ex. multiple key presses on a specific VHF- channel, or by a VHF- request to a harbor master or similar official. Due to different activation processes, the manually activated lights and fog signals do need an additional note on charts. Instead of the note, a reference to an associated publication might be given.

Station Name Position Characteristic Service Details Type Remarks
Mickleden 32° 31,00’S 61° 06,86’E Siren(2) 30s Whistle Horn is activated by keying the mic 5 times on VHF-FM Ch 81. Horn will operate for 30 minutes after activation Sound xxx
Mickledore I 32°30.60´S 61°03.90´E Horn(1)30s Horn is activated by VHF- request to the Jussland radio on ch 16 or ch 71. Horn will operate for the duration agreed with the officials. Sound xxx


In the case of virtual AIS AtoN, the mariner will first and foremost be interested in the position of the "virtual position", even such structure actually do not exist. The range of the AIS AtoN will anyway depend of the actual broadcasting base-station, which might also be interesting for the mariner. This information is usually not displayed on the chart, where distinction between real and synthetic AIS AtoN is not made.

Station Name Position (bold=EPFS) MMSI Service Details Type Details Transmitted Message Type and mode
Mickleden 32° 31,00’S 61° 06,86’E 995791001 Broadcasts msg 21 every 3 minutes, AIS SART repeating Off-position limit is 10 meters Type3, Real 6 8 12 14 21B
Skerries TSS North (V-AIS) 32°20.80´S 61°04.80´E 995796002 Broadcasts every 3 minutes, Base station is JUSSLAND MRCC in position 32°31′.50 S 60°54′.07 E V-AIS permanently marking the north entrance of the Skerries TSS. Virtual 21B
Jussland small arms range 32°40.00 ́S 60°05.60 ́E 99571004 Broadcasts every 3 minutes. , Base station is JUSSLAND MRCC in position 32°31′.50 S 60°54′.07 E This AIS marks a safety sector. The area consists of a circle, having a radius of 5M, and centered upon the position of this tower, extends between an azimuth angle of 250° clockwise to an azimuth angle of 290°. Type1, Synthetic, Predicted 21B

Types of AIS AtoN Station

Type Transmit Capable Receive Capable Operating Mode Configuration Details Type Details Note
1 yes no FATDMA The Type 1 unit must be configured to use the slots reserved for it before being placed into service. This is the simplest type of AIS AtoN station, likely to have low cost and power consumption. The slots used by the Type 1 AIS AtoN station need to be reserved by a competent authority, using Message 20, transmitted from an AIS station in the coverage area.
2 yes yes an AIS receiver of limited capability which allows the Type 2 Station to be remotely configured via the AIS VDL. This receiver operates on a single AIS channel. xxx
3 yes yes (2) FATDMA/RATDMA contains two AIS receiving processes that allow it to participate fully on the AIS VDL. able to receive and relay AIS messages, including control and configuration messages for itself or for other AIS AtoN stations in a chain. The Type 3 AIS AtoN Station is more complex than the Type 1 and Type 2.

Reporting modes for AIS AtoN messages

Mode Message # Transmission type Transmission channels Transmission latency
A 21 alternates between channels 1 & 2 in a subsequent frame that is nominally one reporting interval later.
B 21 quick succession 1 & 2 nominally 4 seconds
C 21 single channel 1 or 2  ?

Virtual AIS

V-AIS is only encoded into S-101 where it is known that the V-AIS is intended to be permanent, or deployed for a specified fixed period.

Where it is known that a V-AIS aid to navigation is moved or withdrawn on a regular basis and/or at short notice, such that implementing these changes through the application of ENC Updates is impractical, the virtual aid should not be encoded. This publication might include some V-AIS that are not included in the S-101 ENC, together with an explanation of the use.

Virtual AtoN deemed not to be appropriate to display in charts or publications are reflected in Maritime Safety Information (MSI).

Using of AIS for urgent, temporary and dynamic information

AIS marking is needed because of a wreck or other obstruction to shipping.

One or several real or V-AIS AtoN will be used to mark the area of danger (as soon as possible for emergency markings). AIS messages will be broadcasted to vessels in the vicinity, the associated markings will be visible ONLY in vessels with updated radar and ECDIS- equipment, capable of displaying AIS AtoN. Procedures for these broadcasts are found in the publication Radio Services.

The V-AIS will normally display as an "emergency wreck marking" or "isolated danger", and have a name best describing the reason of its use.

The base station for these V-AIS objects is JUSSLAND MRCC in position 32°31′.50 S 60°54′.07 E, with a range of 50M.

MMSI- numbers of these AIS AtoN will be in the range between 995796500 and 995796599. The range might be extended by the use of relaying AIS- equipment.

These emergency-marking V-AIS objects will have Unique identifiers according to IALA- recommendation, with character T as the first character of the alphanumeric code.

The identifiers will start from range: JU-A2N-T0000000000000000001, with increasing numbers. Numbers will normally be reused only if a temporary AtoN is periodically used in the exact same position as before.

Non Permanent Markings

Temporary Markings

Markings that change temporarily on a short notice cannot always be updated or included in charts or publications.

The Jussland Notices to Mariners will provide further information of these changes.

Seasonal markings

S-125 should provide additional data on seasonal changes

Seasonal changes to or replacement of buoys in JUSSLAND include those:

  • made during the winter-season
  • during periods of ice risk

Changes to buoys may include:

  • withdrawal of a buoy
  • no replacement of a buoy if adrift
  • no topmark
  • no light
  • replacement by a special ice buoy

Withdrawn buoys can also be substituted by V-AIS, for the season when harsh weather and ice might endanger the physical structure.

IALA-GUID Station Name Position Seasonal Data Daymark Additional
JU-A2N-00901 Special mark 32° 38,50’S 61° 03,35’E Withdrawn for the winter season approx Nov-Apr Special mark Further detail in NtM
JU-A2N-00903 Patter bank 32°24’48”S 61°02’00”E Replaced by V-AIS app. Nov-Apr Further detail in NtM

Reporting of faults in the navigational services

Any faults in the navigational services shall be duly reported to JUSSLAND authorities.

Reports should be made to:

E-mail [mms.notifications@jussland.gov.js]*;

Fax [+999 008675308];

Telephone [+999 008675309].

*Email is preferred, but calls to JUSSLAND MRCC using VHF is also possible. SEASONAL

DGNSS Stations

Using of S-240 (DGNSS Station Almanac) to be investigated. What will the S-125 add that the S-240 doesn't contain?

Category of AtoN

There are three categories of AtoN, reflecting their navigational significance. Also V-AIS objects should be categorized.

Category number level of navigational significance* Example Availability objective %
1 VITAL lighted AtoN and racons that are considered essential for marking landfalls, primary routes, channels, waterways, dangers or the protection of the marine environment. 99.8%
2 IMPORTANT it may include any lighted AtoN and racons that mark secondary routes and those used to supplement the marking of primary routes. 99.0%
3 NECESSARY xxx 97.0%
*An AtoN or system of AtoN that is considered by the Competent Authority to be of this level of navigational significance.

Category of changes to AtoN

There are six categories of changes to AtoNs:

Type number LNTM section Type of Change Notes
1 II Discrepancies
2 III Temporary Changes NOAA doesn't chart
3 IV Chart Corrections ATON related
4 V Advance Notices ATON related
5 VI Proposed Changes ATON related
6 VIII Light List Corrections

Possibly the PS would look at the SORDATE of the chart and/or its last update to determine what would be displayed.

In other words, if the ATON is current the user sees nothing, but if it’s not current, then the mariner would see an indication that the ATON was “Not as Charted” with the info in the attributes.

S-1xx interoperability with S-125

How to ensure the interoperability of the S-101 and the S-125? Unique identifier / Light number / MMSI / Maritime Resource Names

What about Virtual Ais and interoperability?

  • Using of S-240 / S-201 to be investigated

The S-111 surface currents has Notice to Mariner warnings that need to be displayed when surface currents are displayed...will they be here or from Nav Warnings?


V-AIS Emergency marking

  • Probable future use of V-AIS is also dynamic / emergency marking
  • This data will be dynamic and not available to include in charts or publications in advance
  • Procedures for use might be included in a publication.
    • – (Local rules)
    • Relation to Radio services /Traffic services ?
    • V-AIS probably only one part of an emergency marking procedure.

Temporary and Seasonal

  • Temporary markings
  • Buoys that are being withdrawn or substituted with other buoys or V-AIS seasonally
    • – Some changes updated in maps, not all
    • AIS Aton might change type in the process
  • Procedure described in publication
    • Schedule for seasonal changes
    • – Updates of seasonal data

Member States Notice to Mariners

for reference and understanding

S-125 Data Structure (proposed)

items with external links are already in FCD Registry S-125-dataModel.jpg


S101 EquipmentFeatures

Daymark (also S101 NavAidFeature) FogSignal LightAirObstruction LightAllAround LightFogDetector LightSectored PhysicalAISAidToNavigation RadarTransponderBeacon RadioStation RetroReflector SignalStationTraffic SignalStationWarning VirtualAISAidToNavigation

Nautical Services Features

NavigationalServiceBuoy NS_EquipmentFeature NS_StructureFeature

Nautical Services EquipmentFeatures

NS_RadioEquipment NS_LightEquipment

Nautical Services StructureFeatures

NS_NavAidStructure NS_OtherStructure

Nautical Services NavAidStructure Features

NS_NavAidFloatiing NS_NavAidFixed

Nautical Services OtherStructure Features

NS_StructureFloating NS_StructureFixed

S101 NavAidFeatures

BeaconCardinal BeaconIsolatedDanger BeaconLateral BeaconSafeWater BeaconSpecialPurposeGeneral BuildingSingle (also S101 StructureFeature) BuoyCardinal BuoyEmergencyWreckMarking BuoyIsolatedDanger BuoyLateral BuoySafeWater BuoySpecialPurposeGeneral Landmark (or Strucutre?) LightFloat LightVessel Pile (or Structure?) RadarTransponderBeacon (This wasn't in the NavigationalService data model)

S101 StructureFeatures

Bridge Crane FishingFacility FloatingDock FortifiedStructure Hulk MooringWarpingFacility Obstruction OffshorePlatform Pontoon PylonBridgeSupport ShorelineConstruction SiloTank Wreck


ContactDetails NauticalInformation SupplementaryInformation UpdateInformation (that should be used)

complex attribute

maritimeResourceName seasonalReplacement



BuoyReplacementOption function product IALA_aidAvailabilityCategory natureOfConstruction VerticalDatum visuallyConspicuous techniquOfSoundingMeasurement trafficFlow radarConspicuous signalGeneration qualityOfSoundingMeasurement qualityOfPosition status condition marksNavigationalSystemOf


categoryOfSpecialPurposeMark categoryOfCardinalMark categoryOfLandmark categoryOfFogSignal categoryOfLight categoryOfOffshorePlatform categoryOfLateralMark categoryOfInstallationBuoy categoryOfRadarTransponderBeacon categoryOfNavigationLine categoryOfPile categoryOfSiloTank categoryOfRecommendedTrack

color, characteristics, and shape

beaconShape buoyShape colourPattern colour buildingShape lightVisibility exhibitionConditionOfLight lightCharacteristic topmarkDaymarkShape