1. What leaves the ramp with the ULD
International air-cargo tracking covers ULD location, air-cargo containers, AWB status, and the forwarder’s view of the shipment. At the origin airport, transfer hubs, and the destination, the tracker reports position and status into the TMS, IATA cargo systems, and the forwarder platform. The SIM has to work at airports and hubs worldwide, keep up with tight cut-offs, and change networks as the ULD moves country.
SimtoLink provides international IoT SIMs for freight forwarders, air-logistics companies, and airport cargo terminals. Coverage spans 200+ countries and regions and 600+ operator networks, including major airports and hubs, as eSIM or physical SIM, for ULD trackers, container tags, and temperature tags. Air cargo runs on the clock, and tracker data is sent back as events happen.
2. Four places a shipment is watched
Tracking covers freighters, belly cargo, express air freight, and temperature-controlled freight. How live the feed has to be, whether temperature is in scope, and which airports sit on the route all change with the shipment:
ULD tracking and air-cargo containers
A ULD reports its position at origin, transfer, and destination. The tracker talks to the TMS and Cargo iQ so the forwarder gets an ETA, an alert when a transfer goes off plan, and AWB status in step with the unit. That is the trail time-critical air cargo expects.
Temperature-controlled air freight
Pharmaceuticals, fresh produce, and other temperature-controlled cargo need temperature and humidity for the whole journey, in line with GDP and food-safety rules. The logger reports a deviation as it happens and keeps a GDP trail, including temperature mapping across legs and the import report the destination country asks for. That is the record EMA, FDA, and IATA CEIV pharmaceutical air-cargo certification look at.
Forwarders and express
A forwarder and a cargo hub have to know every leg, or a piece is lost or late. The SIM keeps the tracker online at loading, unloading, and transfer. That milestone trail is what CargoiQ (IATA Cargo 2000) quality management asks for.
Airport cargo terminals and transfer
Handling equipment at the hub and in the transfer warehouse stays on the WMS and the IATA cargo system so ULDs turn without a paper chase. The SIM carries receipt and dispatch checks, ULD counts, and live bin locations, in line with IATA RP 1654 and AWB reconciliation at major cargo airports.
3. Data per container
Each container or device uses about 200MB–2GB a month. Most of that is periodic location, temperature, humidity, and status; track replay and bulk history; and waybill sync with the TMS and the airline cargo system. A ULD passes airports in several countries, so the device has to change networks on its own.
Several SIMs can share one data pool, which fits a forwarder with many containers and uneven use on each SIM. The platform reports consumption by country and airport and flags unusual use. Event-triggered reporting and compression bring the data cost down further.
4. Security and the rules air cargo already follows
- Cargo data: Shipments and waybills are commercially sensitive. Send them on a private APN with TLS, in line with GDPR and local data rules.
- IATA and Cargo iQ: Air cargo is expected to meet IATA and Cargo iQ. The SIM is what keeps tracker data reliably in those cargo systems.
- Airports in many countries: The route changes country, so the device has to change networks on its own. Pricing is the same across those countries, and the bill is itemized.
- Staying up: A missed milestone is a late shipment. Multi-operator switching keeps the tracker online when one network drops.
5. What changes for a forwarder’s tracker fleet
Coverage includes major airports and hubs in 200+ countries and regions, so a container takes the best local network at each stop. A shared data pool absorbs the swing between containers. Activation, plan changes, and fault checks sit in one SimtoLink console. APIs connect the platform to TMS, CargoWise, and IATA cargo systems.
6. Putting trackers into service
Count containers and devices, the routes and airports, monthly data, and how the tracker joins the TMS. From that, choose a single SIM or a shared pool, and pay-as-you-go or a monthly bundle. Test at the airports you actually use, against the local operators and the cargo system. Activate SIMs, set the APN, and bind devices in bulk on the SimtoLink platform. After go-live, alert on data use, inspect on a schedule, and keep a response path when a flight irregularity breaks the trail.
SimtoLink already supplies SIMs to freight forwarders and air-logistics companies. An API can tie the platform into TMS and CargoWise. If you are connecting air-cargo trackers, contact SimtoLink for a plan built around your lanes.