Jeppesen Marine Workboat Navigator 1.3 - Manual (Page 138)

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AIS
Many Automatic Identification System (AIS) Transceivers are equipped to transmit
and receive all AIS NMEA sentences. Jeppesen Workboat Navigator intelligently
interprets and displays AIS target data in an easy-to-understand on-screen format,
providing you with the ability to make safer, wiser navigation decisions in shorter
periods of time.
Jeppesen Workboat Navigator includes the capability to include an on-screen mark
for all AIS-compliant boats within radio range, including each boat's velocity vector,
indicating speed and heading. You can also click on each boat's icon to learn the
boat name, course and speed, classification, call sign, registration number, MMSI
Number, and other AIS information.
If there are more than 10 targets in a view, Workboat Navigator will only display
AIS labels for AIS targets that are moving faster than .5 kots or are considred
dangerous.
Types of AIS
ITU-R Recommendation M.1371-1 describes the following types of AIS:
Class A - Mobile equipment on the boat intended for boats meeting the
requirements of IMO AIS carriage requirement. Reporting rate every 10 seconds
when under 14 knots.
Class B - Mobile on the boat equipment is not necessarily in full accord with IMO
AIS carriage requirements. Class B certification standards differ from Class A in the
following ways. Class A:
Does not transmit the boat’s IMO number or call sign.
Has a reporting rate every 30 sec. when under 14 knots.
Does not transmit ETA or destination.
Does not transmit navigational status.
Is only required to receive, not transmit, text safety messages.
Is required to receive, not transmit, application identifiers.
Does not transmit rate of turn information.
Does not transmit maximum present static draught.
Search and Rescue Aircraft - Aircraft mobile equipment, normally reporting every
ten seconds.
Aids to Navigation - Shore-based station providing location of aid.
Normally reports
every three minutes.
This may eventually replace the racon.
AIS Base Station - Shore-based station provides text messages, time
synchronization, meteorological or hydrological information, navigation information,
or position of other boats.
Normally reports every ten seconds.
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