The terms get used interchangeably in procurement conversations, and they should not be. An active GPS e-seal and a passive RFID seal are built for different jobs, and only one of them satisfies corridor transit monitoring in Kenya.

Passive RFID: a checkpoint technology

A passive RFID seal carries no battery. It holds an identifier and answers when a reader energises it at close range. Cost per unit is low, and the technology is well proven for yard management, gate control and container inventory.

Its limitation is structural. The seal is only visible where a reader exists. Between two readers, the cargo is dark. If a tag is interrogated at Mombasa and again at Malaba, what happened across the 900 kilometres between is unknown, and any tamper event is discovered at the second reader rather than at the moment it occurs.

For a warehouse, that is fine. For cargo under customs control on a corridor, it leaves the entire risk window unobserved.

Active GPS: a transit technology

An active seal carries a battery, a GPS receiver and a cellular modem. It reports position on its own schedule and raises events as they happen rather than when someone next scans it.

That gives the monitoring centre three things RFID cannot provide:

• Continuous position, so a deviation from the declared route is visible while the truck is still on it.
• Event-time tamper alerts, so a seal breach raises an alarm at the roadside, not at the next checkpoint.
• Stop detection, which is how most genuine interventions actually begin — a long stop in a place with no reason for one.

The trade-offs are real. Active devices cost more per unit, need charging and battery management, and depend on cellular coverage. Corridor coverage in Kenya is good enough that gaps are short, and devices buffer position data through them, reporting the backlog when the signal returns.

Why the corridor runs on active seals

Transit monitoring exists to protect revenue on cargo that has not yet been taxed. The risk is diversion and substitution in transit, and neither is detectable by a technology that only sees the cargo at the endpoints. That is why the Regional Electronic Cargo Tracking System is built around continuously reporting devices and a staffed monitoring centre, and why the KRA device specification is written for active units.

The practical consequence: if a vendor offers you a passive RFID product for corridor transit compliance, they are not describing an approved ECTS device.

Where RFID still earns its place

None of this makes RFID obsolete. Inside a CFS or bonded warehouse, RFID gate reads are faster and cheaper than any alternative for tracking which container is where on site. Several operators run both: RFID for yard movement, an active seal from the moment the container leaves the gate under customs control.

The two systems answer different questions and there is no real conflict between them.

What to check on an active device

Since KRA fixed the specification, device comparison matters less than it once did. Three things are still worth confirming with any vendor:

• Battery headroom against your longest route, including realistic dwell at the border.
• Health telemetry, so a weak unit is swapped at the depot rather than failing at Mtito Andei.
• Buffering behaviour through coverage gaps, so the audit trail has no holes in it.

Where we sit

Keshi Holdings fits active GPS seals conforming to KRA technical specifications, across both the eSeal and eFuel categories, with health telemetry monitored so that failing units are replaced before they strand a transit.

See how the changeover works, or call +254 705 333 999.