1. A position that does not have to wait for satellite AIS
Ocean-going vessel tracking is the return path for AIS (automatic identification system) data, a VMS (vessel monitoring system), position reports, and LRIT (long-range identification and tracking). Near the coast or alongside, the ship can put position, speed, and course onto a shore platform over cellular, as a supplement to satellite AIS or a cheaper stand-in. The SIM has to be on coastal and port networks, and it has to change country on its own.
SimtoLink supplies international IoT SIMs to shipowners, shipping companies, tracking platforms, and maritime authorities. Coverage is 200+ countries and regions and 600+ operator networks, with the coastal and port layer filled in. At a foreign port or on a nearshore leg the ship takes the local network, the position keeps moving, and the feed stays inside IMO and SOLAS.
2. AIS, the fishing log, LRIT, and the cargo desk
The same coastal SIM serves AIS return, position reports, fishing-vessel monitoring, and maritime supervision. How often the fix has to move, how far from shore the ship still has a signal, and how much data that takes are not the same job:
AIS back to shore
An AIS terminal or a ship tracker sends position, speed, course, and MMSI to a shore VMS and to AIS base stations. Coastal and port cover keeps that up near shore and alongside. It sits beside satellite AIS, and it costs less for the hours the ship is in range.
Fishing vessels and the VMS rule
A distant-water or working fishing vessel has to put position, track, and the catch log on the VMS for the FAO and the national fisheries authority. The SIM keeps the tracker up in territorial waters and on the high seas, for a stored voyage, an IUU position check, and a stock-protection report. The EU fisheries monitoring system (VMS) treats that feed as mandatory.
Position reports and LRIT
The International Maritime Organization (IMO) requires eligible ships to send LRIT (long-range identification and tracking) on a schedule, so the fleet can be seen as a picture rather than a last call. The SIM keeps the ship terminal up for that timed send under SOLAS (the Convention for the Safety of Life at Sea). Port states and flag states both use it.
The tracking platform and the cargo desk
A cargo desk wants ship AIS and onboard sensors in the same view as the TMS and the supply-chain platform. The SIM is the path those ship sensors use. Several sources can be joined, an ETA can move, and an exception can fire. That is the visibility a shipper, a forwarder, and a port operator now ask to see on one screen.
3. A fix every minute, or every ten
Each ship uses about 200MB–2GB a month. Most of that is AIS position, speed, and course, usually every minute to every 10 minutes; trail playback and history; and a burst of sync when the ship is in port. The ship calls in more than one country, so the tracker has to change networks without a crew step.
A shared pool fits a fleet where one ship is reporting often and another is quiet. The platform totals use by country and port and flags a jump. Adaptive reporting — a shorter interval when speed changes — and compression keep a one-minute fix from becoming the whole bill.
4. The track, the flag state, and the box on deck
- Position and route: Both are commercially sensitive, and both are a security matter. Send them on a private APN with TLS, inside each country’s maritime data rules.
- IMO and SOLAS: The International Maritime Organization (IMO) requires AIS, LRIT, and related kit. The SIM is a ship-to-shore channel for that duty.
- A different port each week: The tracker has to join the local network by itself. Pricing is the same across those countries, and each port is visible on the bill.
- On deck: The unit takes salt fog, shock, and a wide temperature swing. The SIM uses an industrial chip for that.
5. Cellular for the hours the ship is in range
Coastal and port networks in 200+ countries and regions mean a ship takes the best local network alongside or near shore. A shared pool absorbs a fleet that does not report evenly. Activation, plan changes, and fault checks sit in one SimtoLink console. APIs connect that console to the VMS, the AIS platform, and the TMS.
6. Before the first position hits the shore platform
Count ships, routes and ports, monthly data, and how the tracker joins the VMS and the AIS platform. From that, choose a single SIM or a shared pool, and pay-as-you-go or a monthly bundle. Test at the ports on the actual route, against the local operators and the tracking platform. Activate SIMs, set the APN, and bind ships in bulk on the SimtoLink platform. After go-live, alert on data use, inspect on a schedule, and keep a response path when a position stops arriving.
SimtoLink already supplies shipowners, shipping companies, and tracking platforms. An API can tie the platform into the VMS, the AIS platform, and the TMS. If you are putting a coastal return path on an ocean-going ship, contact SimtoLink for a plan built around those ports.