AIS Factsheet - Dry Bulk

Notes on the provided data:

  • Sources of AIS data: Satellite and Terrestrial data has been extracted from Spire Global’s data archives
  • The data time range is between the first day of the selected month at 00:00:00 UTC and the first day of the following month at 00:00:00 UTC (for example January 2020's time range is between 2020-01-01 at 00:00:00 UTC and 2020-02-01 at 00:00:00 UTC)
  • Data has been extracted for global region
  • Vessels Include: Bulk Carriers

Different AIS Messages:

Spire AIS data sample files contain records representing different types of AIS messages.

Message Types 1, 2, 3, 18, 19, 27 are position messages and contain values in the position related fields.

Message Types 5 & 24 are static voyage messages and contain values in the static details and voyage related fields.

To identify the Name, IMO number or type of ships related to the AIS Position reports, the MMSI number must be used to join together the 2 different sets of AIS data.

IE if position reports are recorded against MMSI 636018333 in AIS message type 1 then the IMO and name of that vessel is discovered by looking for AIS message type 5 reported using the same MMSI number as shown below.

Table showing the distribution of values in key fields from different AIS messages

AIS Data Sample File Column Descriptions:

Column Data Type Descriptions
created_at date ISO 8601 formatted timestamp in UTC of the time the vessel record was created
timestamp string ISO 8601 formatted timestamp in UTC of the time the AIS message was transmitted
msg_type integer AIS message type

Common values:

1, 2, 3, 5, 18, 19, 24, 27

AIS message types are explained in more details here

mmsi integer The  Maritime Mobile Service Identity of the vessel transmitting the AIS message

Possible values:

000000000 – 999999999

latitude float Vessel latitude in degrees

(North = positive, South = negative)

range -90 to +90

longitude float Vessel longitude in degrees

(East = positive, West = negative)

range = -180 to +180

speed number Vessel speed over ground represented in knots

Possible values:

0 – 102.2 knots, 102.3 (not available)

course number Vessel course over ground in degrees

Possible values:

0 – 359.9 degrees, 360.0 (not available)

heading number Vessel true heading in degrees

Possible values:

0 – 359 degrees, 511 (not available)

rot integer Vessel rate of turn

Possible values:

-127 – 127; -128 (not available)

imo integer IMO number of the ship

Unique International Maritime Organization number for the vessel that stays with the ship for it’s life

valid values 7 digit number

name string Vessel name
call_sign string Vessel call sign
draught float Vessel draught represented in 1/10 meters

Possible values:

0.1 – 255, 0 (not available; default)

ship_and_cargo_type integer Vessel ship and cargo type code

Some common values:

30 (fishing vessel), 52 (tug boat), 70 (cargo/fishing ship)

more information on determining the ship type is detailed here

length number Vessel length extracted from ship dimensions to_bow and to_stern in meters
width number Vessel width extracted from ship dimensions to_port and to_starboard in meters
eta string Vessel estimated time of arrival as entered by the captain, represented in ISO 8601 format

Possible values:

Month: 1 – 12, 0 (not available; default); Day: 1 – 31, 0 (not available; default); Hour: 0 – 23, 24 (not available; default); Minute: 0 – 59, 60 (not available; default)

destination string Vessel destination as entered by the vessel captain
status integer Vessel navigation status

Some common values:

0 (under way using engine), 1 (at anchor), 3 (restricted maneuverability), 7 (engaged in fishing), 15

maneuver integer Vessel maneuver code

Valid values:

0 (not available; default), 1 (not engaged in special maneuver), 2 (engaged in special maneuver)

accuracy integer Vessel GPS geo location accuracy in meters

Possible values:

1 (high, <=10 meters); 0 (low, >10 meters, default)

collection_type string How the message was captured

Possible values:

satellite or terrestrial or dynamic

to_bow integer Distance from AIS transponder to the bow side edge in meters (Hull dimension A)
to_stern integer Distance from AIS transponder to the stern side edge in meters (Hull dimension B)
to_port integer Distance from AIS transponder to the port side edge in meters (Hull dimension C)
to_starboard integer Distance from AIS transponder to the starbord side edge in meters (Hull dimension D)

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