Where does HiFleet AIS data come from, and how do terrestrial, satellite and mobile AIS differ?

Vessel dynamics mainly come from shipborne AIS broadcasts collected via terrestrial stations, satellite AIS, mobile receivers and partner networks. Coastal terrestrial updates are usually denser; satellite AIS extends offshore coverage but may be intermittent; mobile AIS fills gaps. Coverage, latency and completeness differ by source.

How are historical tracks, voyages and port calls generated, and what are the limits?

Tracks are built from ordered AIS positions and may be thinned or filtered. Voyages and port calls are inferred from geofences, stop patterns and speed changes, and may differ from reality when signals drop or definitions vary—use for operations and research reference only.

HiFleet data sources, processing and quality

This page describes HiFleet maritime data sources, processing, update/coverage, quality limits and correction channels. Product capabilities, fields and permissions are subject to the relevant pages and service agreements.

AIS data sources

Vessel dynamics primarily come from shipborne AIS broadcasts collected via terrestrial AIS stations, satellite AIS, mobile receivers and partner networks. Messages are received, parsed and stored to produce position, speed, course and related navigation attributes.

Terrestrial, satellite and mobile AIS

Terrestrial AIS provides denser updates near coasts and key fairways. Satellite AIS extends global/offshore coverage but may be intermittent due to passes and signal collisions. Mobile AIS supplements fixed coverage where receivers are deployed. Coverage, latency and completeness differ by source.

Deduplication and vessel matching

Multi-source AIS messages are matched, deduplicated and standardized, mainly using MMSI, IMO and vessel name, with consistency checks on time and kinematics. Conflicts or missing identifiers are handled by retention rules or pending-review flags.

Tracks, voyages and port calls

Historical tracks are built from ordered AIS positions, optionally thinned or filtered. Voyages and port calls are inferred from geofences, berth/stop patterns and speed changes, and may differ from reality when signals drop or definitions vary.

Ship particulars and port data

HiFleet maintains ship particulars for about 120,000 internationally trading merchant vessels and over 50,000 China domestic-trade vessels, updated daily. Fields may include identity, photos, type, flag, build data, dimensions, capacity, tonnage, equipment, machinery, class, surveys, insurance, companies and MMSI changes; completeness varies by vessel, region, source and account rights. Port guides and other non-AIS datasets may come from public, licensed, partner and processed sources.

Update cadence and coverage

AIS is continuously ingested; coastal terrestrial updates are usually denser than satellite/offshore. Particulars refresh daily; other datasets follow partner/product cycles. Coverage is uneven—ports and busy lanes are typically denser than remote areas or periods with equipment off.

Missing, delayed or anomalous data

Gaps, jumps, delays and inconsistent static fields can occur due to equipment, coverage, satellite passes, communications, manual reporting and processing latency. Use for fleet operations, research and risk monitoring—not as the sole basis for collision avoidance, seaworthiness, legal determination or trading decisions.

Third-party data and IP

Licensed charts, partner marks and third-party content remain owned by their rights holders. Users must follow HiFleet terms and third-party licenses; unauthorized bulk scraping or redistribution is prohibited.

Corrections and feedback

Report errors via support@hifleet.com or Contact us. For vessel particulars, include IMO, incorrect field, a verifiable reference and your contact details; for port data, include port name, incorrect field and reference.

Published: 2026-08-10

Last reviewed: 2026-08-21

Reviewed by: HiFleet Data Product Team (Shanghai Maili Marine Technology Co., Ltd.)

中文版 · API documentation

FAQ

Answers below align with this page’s data methodology. For API product capabilities, fields and integration, see the separate API documentation.

Where does HiFleet AIS data come from, and how do terrestrial, satellite and mobile AIS differ?: Vessel dynamics mainly come from shipborne AIS broadcasts collected via terrestrial stations, satellite AIS, mobile receivers and partner networks. Coastal terrestrial updates are usually denser; satellite AIS extends offshore coverage but may be intermittent; mobile AIS fills gaps. Coverage, latency and completeness differ by source.
What is the coverage and update cadence of ship particulars?: HiFleet maintains particulars for about 120,000 internationally trading merchant vessels and over 50,000 China domestic-trade vessels, updated daily. Field completeness varies by vessel, region, source and account rights. Report errors via support@hifleet.com or Contact us with IMO, incorrect field, reference and contact details.
How are historical tracks, voyages and port calls generated, and what are the limits?: Tracks are built from ordered AIS positions and may be thinned or filtered. Voyages and port calls are inferred from geofences, stop patterns and speed changes, and may differ from reality when signals drop or definitions vary—use for operations and research reference only.
How do I submit a data correction?: Email support@hifleet.com or use Contact us. For vessels, include IMO, incorrect field, a verifiable reference and your contact details; for ports, include port name, incorrect field and reference.