If you’re an avid recreational boater, you’ll no longer be inhibited by limitations like line-of-
sight radar, even in fog and darkness. You’ll be able to “see” around capes, river bends,
ships, and other obstructions.
Fugawi Marine ENC Ver. 4.1 now includes advanced support for AIS (Automatic Identification
System) receivers.
The Automatic Identification System (AIS) permits you to track the path of ships that are
transmitting AIS signals. Many commercial ships in many regions of the world transmit AIS
signals according to government regulations.
You must have an industry standard AIS receiver to take advantage of the AIS capability in
Fugawi.
(You can test Fugawi Marine ENC using a sample AIS file)
Some of the advanced features of Fugawi Marine ENC:
- Supports Class A and Class B AIS messages
- Calculates CPA and TCPA
- Graphically displays vessels in Collision Danger in Bold
- User option to perform Dead Reckoning of AIS vessels between AIS updates
- Uses vessel Rate of Turn to plot curved course prediction path
- Vessels drawn to scale
As the AIS messages are received, Fugawi Marine ENC will populate the AIS table and plot
the AIS vessels on the open chart or map.
The AIS table displays detail about every AIS vessel being received. You can sort any column
by clicking on the column header. Click on any entry to center the map on the selected AIS
vessel.
The following information is presented (assuming data are being transmitted by the AIS
equipped vessel):
- Vessel Name
- AIS Class: - A or B
- MMSI # - A unique Maritime Mobile Service Identity
- Vessel Type
- CPA - The Closest Point of Approach (CPA) calculation is performed if Fugawi is
receiving your position from your GPS receiver. CPA is the distance you will be from
an AIS vessel when you are nearest to it. The calculation is based on the current
position, course and speed of your boat and each AIS vessel at the time of the last
message. - TCPA - The Time to Closest Point of Approach (TCPA) calculation is performed if
Fugawi is receiving your position from your GPS receiver. TCPA is the time (in
minutes from now) at which your distance to the AIS vessel will be closest. The
calculation is based on the current position, course and speed of your boat and the
AIS vessel at the time of the last message. The TCPA will change when either
vessel's course and speed are altered. - Range to Vessel - Displays the current distance between your GPS position and the
AIS vessel at the time of the last message. - Bearing to Vessel - Displays the current bearing from your GPS position to the AIS
vessel at the time of the last message. - Speed of Vessel - Displays the current speed of the AIS vessel at the time of the last
message. - Heading of Vessel - Displays the current Heading of the AIS vessel at the time of the
last message. The heading is only completed if the AIS vessel has a heading
indicator (such as a gyro compass) connected to the AIS transmitter. Heading is not
derived from the change in the AIS vessel GPS location, which yields only a course
over ground. For example, the bow of the boat might be pointed east (heading) while
the boat is traveling north-east (course over ground). - COG of Vessel - Displays the current Course Over Ground (COG) of the AIS vessel at
the time of the last message. The COG may be different from the heading due to
currents, vessel thrusters, steering lag, wind, etc. - Rate of Turn of Vessel - Displays the current Rate of Turn (ROT) in degrees per
minute of the AIS vessel at the time of the last message. - Call Sign - The call sign of the vessel as entered into the AIS system by the navigator.
- Length - The length of the vessel in meters as entered into the AIS system by the
navigator. - Beam - The width of the vessel in meters as entered into the AIS system by the
navigator. - Draught - The draught of the vessel in meters as entered into the AIS system by the
navigator. - Destination - The destination of the vessel as entered into the AIS system by the
navigator - IMON - International Maritime Organization Number of the vessel as entered into the
AIS system by the navigator. - ETA - The Estimated Time of Arrival of the AIS vessel. This is a date in the format
MM/DD/hh:mm, according to the AIS standard. However some vessels incorrectly
input their ETA date as DD/MM/hh.mm. - Last Msg Age - Elapsed time since the last AIS message was received from the AIS
vessel. - Nav Status: The navigational status of the vessel as entered into the AIS system by
the navigator
- Vessel Colors - The AIS vessels on the screen are color coded based on whether
they are underway, stationary, lost signal or in possible danger of collision with your
vessel. The colors are user definable. The defaults are as follows:
- Collision Danger = Red with bold outline (TCPA <= 30 minutes, CPA <= 1/2
mile)
Underway = Green (speed > 1 Knot, AIS update received during past 5 minutes)
Stationary = Yellow (speed < 1 Knot, AIS update received during past 5
minutes)
Lost signal = Orange with cross through it (AIS update not received during past
5 minutes)
- Vessel Outline - The outline of the AIS vessel is drawn to scale if: the length and
beam are received, and the length is greater than the length of isosceles triangle at
the map scale. AIS Vessels in collision danger are outlined in bold. - Vessel Labels - AIS vessel names are labeled when the map is sufficiently zoomed
in. Class A or B type of AIS system is places in brackets after the AIS vessel name. AIS
vessels in collision danger also have TCPA and CPA in the label. Label settings are
user definable - Vessel History - AIS vessel history is drawn as a dot at each AIS location received,
with line segments joining the dots. The display of lines and dots and how many
historical positions to display are user definable. - Vessel Heading - The AIS vessel heading is displayed as a solid line only if heading
is being received in the AIS sentence (from ship gyro compass). The heading is
displayed as a line emanating from the bow of the ship. The length of the heading line
is not related to vessel speed. - Vessel Rate of Turn - If Rate of Turn is being received for an AIS vessel, a "barb" is
added to the end of the heading vector, at right angles and pointing in the direction of
turn. - Vessel Course Over Ground (COG) - COG is calculated from the delta of previous
GPS locations and is displayed as a dashed line. If the length and width of the AIS
vessel are being received, the COG vector emanates from the location of the GPS
sensor on the vessel. If the length and width of the AIS vessel are not being received,
the COG emanates from the bow of the ship. The length of the COG vector is
determined by the user. If Rate of Turn is being received, the COG vector becomes a
curved path, which is calculated from COG, Rate of Turn and Time.
- Dead Reckoning - The user can choose to apply dead reckoning to the AIS vessels.
Dead reckoning will move each AIS vessel between AIS messages according to its
last known point, COG and Rate of Turn (if any). See the AIS General tab for more
details.
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