{"id":2113,"date":"2014-04-28T15:08:37","date_gmt":"2014-04-28T13:08:37","guid":{"rendered":"https:\/\/www.easyais.com\/en\/?page_id=2113"},"modified":"2025-12-18T16:04:18","modified_gmt":"2025-12-18T14:04:18","slug":"what-is-ais","status":"publish","type":"page","link":"https:\/\/www.easyais.com\/en\/ais-info\/what-is-ais\/","title":{"rendered":"What is AIS?"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.16&#8243; background_color=&#8221;#f4f4f4&#8243; custom_padding=&#8221;0px||0px|&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row column_structure=&#8221;3_4,1_4&#8243; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; custom_padding=&#8221;0px||0px|&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;3_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][\/et_pb_column][et_pb_column type=&#8221;1_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text admin_label=&#8221;Sprachen&#8221; _builder_version=&#8221;4.16&#8243; text_text_color=&#8221;#003d8f&#8221; header_text_color=&#8221;#ffffff&#8221; background_color=&#8221;#f4f4f4&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; text_orientation=&#8221;right&#8221; use_border_color=&#8221;off&#8221; saved_tabs=&#8221;all&#8221; global_colors_info=&#8221;{}&#8221;]<br \/>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.16&#8243; background_color=&#8221;rgba(0,0,0,0)&#8221; custom_padding=&#8221;2px||1px|&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.16&#8243; background_color=&#8221;rgba(0,0,0,0)&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;What is AIS?&#8221; _builder_version=&#8221;4.24.2&#8243; text_font=&#8221;||||||||&#8221; text_font_size=&#8221;30px&#8221; header_2_font_size=&#8221;35px&#8221; header_2_font_size_tablet=&#8221;27px&#8221; header_2_font_size_phone=&#8221;20px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1 style=\"text-align: center;\"><strong><span class=\"et_pb_fullwidth_header_subhead\">What is AIS?<br \/><\/span><\/strong><\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.21.0&#8243; text_font=&#8221;||||||||&#8221; text_text_color=&#8221;#747d88&#8243; text_line_height=&#8221;1.8em&#8221; text_orientation=&#8221;center&#8221; max_width=&#8221;900px&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;|||&#8221; animation_style=&#8221;slide&#8221; animation_direction=&#8221;bottom&#8221; animation_delay=&#8221;100ms&#8221; animation_intensity_slide=&#8221;4%&#8221; z_index_tablet=&#8221;500&#8243; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p style=\"text-align: center;\"><span class=\"fs20\"><span class=\"ff1 cf0\"><strong>AIS = Automatic Identification System<\/strong><\/span><br \/>A quick look at the basic technology<\/span><\/p>\n<p>[\/et_pb_text][et_pb_divider _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;section&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221; column_structure=&#8221;3_5,2_5&#8243;][et_pb_column type=&#8221;3_5&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_image src=&#8221;https:\/\/www.easyais.com\/wp-content\/uploads\/2014\/04\/automatic-identification-system.png&#8221; show_in_lightbox=&#8221;on&#8221; align=&#8221;center&#8221; align_tablet=&#8221;center&#8221; align_phone=&#8221;&#8221; align_last_edited=&#8221;on|desktop&#8221; _builder_version=&#8221;4.16&#8243; animation_style=&#8221;slide&#8221; animation_direction=&#8221;left&#8221; animation_duration=&#8221;500ms&#8221; animation_intensity_slide=&#8221;10%&#8221; use_border_color=&#8221;off&#8221; border_color=&#8221;#ffffff&#8221; border_style=&#8221;solid&#8221; animation=&#8221;left&#8221; sticky=&#8221;off&#8221; always_center_on_mobile=&#8221;on&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_cta title=&#8221;The right AIS equipment for your needs!&#8221; button_url=&#8221;https:\/\/easyais-shop.com\/en\/&#8221; url_new_window=&#8221;on&#8221; button_text=&#8221;Shop now&#8221; admin_label=&#8221;Call-to-Action: Shop&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_button=&#8221;on&#8221; button_bg_color=&#8221;#E09900&#8243; button_icon=&#8221;&#xe015;||divi||400&#8243; button_on_hover=&#8221;off&#8221; link_option_url=&#8221;https:\/\/easyais-shop.com\/en\/&#8221; link_option_url_new_window=&#8221;on&#8221; hover_enabled=&#8221;0&#8243; border_radii=&#8221;on|15px|15px|15px|15px&#8221; box_shadow_style=&#8221;preset2&#8243; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; button_bg_color__hover_enabled=&#8221;on|desktop&#8221; button_text_color__hover_enabled=&#8221;on|hover&#8221; button_text_color__hover=&#8221;#E09900&#8243; button_bg_color__hover=&#8221;#ffffff&#8221; button_bg_enable_color__hover=&#8221;on&#8221; sticky_enabled=&#8221;0&#8243;][\/et_pb_cta][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; admin_label=&#8221;row&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text _builder_version=&#8221;4.21.0&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3>Summary:<\/h3>\n<p>The Automatic Identification System (AIS) is a maritime transponder\/receiver system defined by the IMO (<a href=\"http:\/\/www.imo.org\" target=\"_blank\" rel=\"noopener noreferrer\">international maritime organization<\/a>) AIS operates in the VHF frequency band. AIS main objectives are :<\/p>\n<ul>\n<li>\u00a0to improve maritime safety<\/li>\n<li>\u00a0to protect the maritime environment<\/li>\n<\/ul>\n<h3>Practically the AIS:<\/h3>\n<ul>\n<li>assists collision avoidance (AIS ship-to-ship)<\/li>\n<li>enables ports and coastal states to identify ships and to manage and supervise the traffic in their waters (AIS Coast station).<\/li>\n<\/ul>\n<h3>Description:<\/h3>\n<p>AIS is a system used by ships and vessels for identification at sea. It helps to resolve the difficulty of identifying ships when not in sight (e.g. at night, in radar blind arcs or shadows or at distance) by providing ID, position, course, speed and other ship data with all other nearby ships and VTS stations. The IMO SOLAS requires AIS to be fitted aboard all ships of gross tonnage &gt;= 300 for international voyages. The ship data is displayed on a AIS data capable chartplotter with an ship symbol or even on AIS data capable navigation software.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;]AIS transponders automatically transmit the position and velocity of the ship at regular intervals via a VHF radio built into the AIS. The position and velocity originate from the ship&#8217;s GPS or, if that fails, from an integral GPS receiver.<\/p>\n<p>The AIS also receives heading information from the ship&#8217;s compass and transmits this at the same time. Other information, such as the vessel name and VHF call sign, is entered when installing the equipment and is transmitted less frequently. The signals are received by AIS transponders fitted on other ships or on land based systems, such as VTS systems.<\/p>\n<p>In order to ensure that the VHF transmissions of different AIS transponders do not occur at the same time they are time multiplexed. In order to make the most efficient use of the bandwidth available, vessels which are anchored or are moving slowly transmit less frequently than those that are moving faster or are maneuvering. The update rate of fast maneuvering vessels is similar to that of a conventional marine radar.<br \/>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_divider color=&#8221;#1e73be&#8221; disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; admin_label=&#8221;row&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;]AIS transceiver sends the following data every 2 to 10 seconds depending on vessels speed while underway, and every 3 minutes while vessel is at anchor. This data includes :<\/p>\n<ul>\n<li>MMSI number of vessel &#8211; vessel&#8217;s unique identification<\/li>\n<li>Navigation status &#8211; &#8220;at anchor&#8221;, &#8220;under way using engine&#8221; or &#8220;not under command&#8221;<\/li>\n<li>Rate of turn &#8211; right or left, 0 to 720 degrees per minute<\/li>\n<li>Speed over ground &#8211; 0.1 knot resolution from 0 to 102 knots<\/li>\n<li>Position accuracy<\/li>\n<li>Longitude &#8211; to 1\/10000 minute and Latitude &#8211; to 1\/10000 minute<\/li>\n<li>Course over ground &#8211; relative to true north to 0.1 degree<\/li>\n<li>True Heading &#8211; 0 to 359 degrees from eg. gyro compass<\/li>\n<li>Time stamp &#8211; UTC time accurate to nearest second when this data was generated<\/li>\n<\/ul>\n<p>Not all of above data is displayed (Quantity of shown data is software of the Chartplotter).<\/p>\n<p>&nbsp;<br \/>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;]Typically you can see on the chartplotter following data :<\/p>\n<ul>\n<li>MMSI number of vessel &#8211; vessel&#8217;s unique identification<\/li>\n<li>Speed over ground &#8211; 0.1 knot resolution from 0 to 102 knots<\/li>\n<li>Course over ground &#8211; relative to true north to 0.1 degree<\/li>\n<\/ul>\n<p>In addition, the following data is broadcast every 6 minutes:<\/p>\n<ul>\n<li>MMSI number &#8211; vessel&#8217;s unique identification<\/li>\n<li>IMO number<\/li>\n<li>Radio call sign &#8211; international radio call sign assigned to vessel<\/li>\n<li>Name &#8211; Name of vessel, max 20 characters<\/li>\n<li>Type of ship\/cargo<\/li>\n<li>Dimensions of ship &#8211; to nearest meter<\/li>\n<li>Location of positioning system&#8217;s (eg. GPS) antenna onboard the vessel<\/li>\n<li>Draught of ship &#8211; 0.1 meter to 25.5 meters<\/li>\n<li>Destination &#8211; max 20 characters<\/li>\n<li>ETA (estimated time of arrival) at destination &#8211; UTC month\/date hour:minute<\/li>\n<\/ul>\n<p>&nbsp;<br \/>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=&#8221;row&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; global_colors_info=&#8221;{}&#8221;]The AIS is mandatory since 2002 for ships constructed on or after July 2002. It is already fully effective for passenger ships and tankers constructed before July 2002 engaged on international voyages. End of July 2004, it will be mandatory to all cargo ships 50,000 gt engaged on international voyages. It will be adopted by all ships of 300 gt and upwards engaged on international voyages or not, in 2008.<\/p>\n<p>Above given information is not complete and should give only an overview about the AIS topic. For more details please have a look to the following links :<\/p>\n<p><a href='http:\/\/www.navcen.uscg.gov\/?pageName=AISmain' class='icon-button search-icon' target=\"_blank\">US Coust Guard<span class='et-icon'><\/span><\/a><a href='http:\/\/www.imo.org' class='icon-button search-icon' target=\"_blank\">www.imo.org<span class='et-icon'><\/span><\/a><a href='http:\/\/www.aislive.com\/' class='icon-button search-icon' target=\"_blank\">www.aislive.com<span class='et-icon'><\/span><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<br \/>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p> What is AIS?AIS = Automatic Identification SystemA quick look at the basic technologySummary: The Automatic Identification System (AIS) is a maritime transponder\/receiver system defined by the IMO (international maritime organization) AIS operates in the VHF frequency band. AIS main objectives are : \u00a0to improve maritime safety \u00a0to protect the maritime environment Practically the AIS: [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2035,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-2113","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What is AIS? Overview | Weatherdock<\/title>\n<meta name=\"description\" content=\"What is AIS? AIS = Automatic Identification System. Sending dynamic ship data increases safety in shipping. 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