Short answer: yes, with the right device and placement — but physics sets the rules. A shipping container is a steel box, and steel attenuates the radio signals a tracker depends on: GPS satellite signals coming in, and cellular signals going out. Here’s what actually works.
Why containers are hard on trackers
A closed steel container behaves like a partial Faraday cage. GPS signals are already faint by the time they reach the ground; several millimeters of steel can block them outright. Cellular signals are stronger and lower-frequency, so they penetrate somewhat better, but a tracker buried mid-container under cargo may have no usable signal at all.
What makes container tracking work anyway
- Placement near the doors or vents. Container doors have rubber gaskets, and containers have vent openings — radio energy leaks through these gaps. A tracker mounted high on the door interior (or in the door recess) performs dramatically better than one deep inside.
- External and door-mounted trackers. Purpose-built container trackers mount outside or in the door structure, where they see the sky. Solar-powered units like our solar GPS trackers recharge themselves on deck or in the yard, so they run for the life of the shipment.
- Store-and-forward logging. Good trackers don’t lose data when they lose signal — they keep logging GPS positions (or last-known positions and sensor readings) in memory, then upload the whole history the moment they reconnect. You see gaps in live visibility, not gaps in the record.
- Assisted positioning. When GPS is blocked, modern trackers can estimate location from cell towers and Wi-Fi signals they can hear — coarser than GPS, but often enough to know which port or yard the box is in.
The honest limitations
- A container buried mid-stack on a ship will usually be silent until it’s unloaded. Expect that, and rely on store-and-forward.
- Ocean crossings mean no cellular coverage regardless of placement; positions resume at the next port. (Satellite-uplink trackers exist for true mid-ocean visibility at a higher cost.)
- Temperature-sensitive cargo needs sensors inside the box even if the tracker antenna is at the doors — that’s what wireless BLE sensors are for, talking to the tracker a few feet away. See our temperature, humidity and door sensors.
What we’d actually recommend
For trailers and containers moving on road and rail: a trailer & container GPS tracker — solar or long-life battery — mounted with sky view. For cold chain: add BLE temperature sensors inside. For yards and ports: BLE tags plus a gateway give you inventory-level visibility without a cellular plan per box. Tell us what you’re shipping and we’ll spec it honestly — including what won’t work.
