GPS Tracking for Refrigerated Trucks (Cold Chain)

What this page covers Why refrigerated transport (frigorifique) needs more than vehicle-tracking GPS: temperature monitoring with chain-of-custody history, alerts on excursion events, and audit-grade exports for pharmaceutical, food, and vaccine logistics. The feature stack, the pain points cold-chain operators actually face, and how to think about it for West African operations.

Key takeaways

Cold chain failure isn't just a logistics problem. A vaccine batch that loses cold compliance for 90 minutes is a destroyed batch. A pharmaceutical shipment with a temperature excursion event and no audit trail is a rejected shipment. The cost of a single compliance failure is often higher than the entire monthly GPS subscription bill across the fleet.
Three sensor inputs matter. Cargo-zone temperature (the actual cold compartment), ambient temperature (for context and contrast), and door-open events (the most common excursion trigger). Single-sensor deployments miss the why.
Audit-grade history is the deliverable. Customer pharmacies, vaccine programs, food retailers, and insurance auditors all want exportable temperature logs per route per shipment. The GPS platform should produce these without manual work.
Live alerts compress reaction time from hours to minutes. A temperature excursion at 03:00 needs to wake someone, not wait until the morning shift.
Hardwired install with redundant power is non-optional for cold chain. A refrigerated truck running 12-24 hour routes can't tolerate sensor downtime due to a battery drain.

Why cold-chain GPS is different

A standard truck GPS tracks where the truck is and how it's being driven. A cold-chain GPS adds: what is the cargo's temperature right now, has it ever been outside its acceptable window during this shipment, and can you prove it after the fact.

The asymmetry of cold-chain failures is what drives the design. A late delivery is recoverable: the receiver waits. A spoiled delivery is not. The cargo is destroyed, the customer is breached, the contract is at risk, and depending on the cargo type (pharmaceutical, vaccine), there are regulatory consequences too.

This means the GPS stack for cold chain has different priorities:

Temperature data is collected at high frequency (every minute or every position)
Alert latency must be measured in minutes, not hours
Logs must be exportable in formats acceptable to auditors
The hardware must keep running through power, network, and door-open events without missing data

The three sensors that matter

1. Cargo-zone temperature

The primary signal. Sensor mounted inside the refrigerated compartment, in the cargo zone (not at the evaporator, not by the door: those read low and high respectively and don't reflect what the cargo is actually experiencing).

Sample rate: every position (typically every 10-30 seconds) or every 60 seconds at minimum. Higher frequency gives you better excursion detection and a tighter audit trail.

2. Ambient (driver-cabin) temperature

Secondary signal for context. When cargo zone trends up, you want to know if it's because the ambient is hot (expected behavior), the door was opened (event-driven excursion), or the refrigeration unit is failing (mechanical issue). Without ambient, you can only guess.

3. Door-open events

Reed switch or contact sensor on the cargo door. Every open event is logged with timestamp and GPS location. This explains 70%+ of normal temperature excursions: opening the door at a delivery point lets ambient air in, the cargo zone trends up briefly, then the refrigeration unit recovers. With door-open data, the audit log shows "excursion explained by delivery event"; without it, the same data looks like a fault.

Optional fourth sensor: refrigeration-unit power state (running / off / standby). Useful for fleets where drivers occasionally switch off the refrigeration unit for fuel reasons (a serious compliance breach). Detection requires CAN bus integration with the refrigeration unit.

Audit-grade history and chain of custody

The deliverable for cold-chain customers (pharmacies, hospitals, vaccine programs, food retailers) is not a live dashboard. It's a per-shipment temperature log they can put in their compliance file.

Structure of an audit-grade export:

Shipment ID (linked to your dispatch system or contract reference)
Cargo description
Pickup time + location + initial temperature reading
Continuous temperature time-series (every position)
Door-open events with timestamps and locations
Excursion events (any reading outside the configured window) with severity, duration, and root cause if available
Delivery time + location + final temperature reading
Driver signature / receiver signature (if your platform integrates with a digital proof-of-delivery)

Traxelio exports this as a PDF or CSV per shipment. For high-frequency operators (50+ shipments/day), the export can be wired into your ERP via API.

Live alerts and excursion thresholds

The alert configuration is per cargo type, often per shipment. A pharmaceutical batch tolerates a different excursion window than a frozen-food shipment.

Typical configurations:

Pharmaceutical (2-8°C cold chain): alert on any reading >8°C for >5 minutes, or any reading <2°C for >5 minutes
Vaccine cold chain (2-8°C, stricter): alert on any reading outside window for >2 minutes
Frozen food (-18°C target): alert on any reading > -15°C for >10 minutes
Chilled food (0-4°C): alert on any reading >6°C for >15 minutes

Alerts route to: dispatcher (immediate), customer (configurable), driver (in-vehicle visual or audio if supported).

The trick is balancing sensitivity (don't miss a real excursion) with noise (don't fire on every door-open event). Door-open-suppressed excursion windows are the standard approach: if a temperature excursion starts within 30 seconds of a door-open event and resolves within 5 minutes, suppress the alert and log it as a "delivery event" instead.

Use cases by cargo type

Pharmaceutical and vaccine logistics

Cold-chain compliance is regulatory. The audit log isn't optional: it's the document customs, customers, and licensors require. Operators in this segment typically need:

Sub-minute temperature sampling
Sub-2-minute alert latency
PDF audit exports per shipment
Integration with track-and-trace systems (ERP, government registries)
Calibration certificates for sensors (annual, per unit)

For West African vaccine programs (PEV / EPI campaigns), the cold-chain stack supports rural delivery to clinics where ambient temperature is high and refrigeration runtime is long.

Food and beverage distribution

Less regulatory, more contractual. Customer (supermarket chain, restaurant group) typically writes excursion-tolerance clauses into the contract. Failure to maintain temperature triggers chargebacks or refusals at the dock.

The optimization here is fuel: refrigeration units consume fuel, and over-cooling (running the unit colder than needed for safety margin) can be 10-20% of unit fuel use. Setpoint optimization, paired with door-open suppression and ambient awareness, is a real cost-saver on a 30-truck fleet.

Floral / horticultural

Often forgotten. Cut flowers and high-value horticulture have narrow temperature windows and short shelf life. Same stack as pharmaceutical but with different threshold tuning.

Pricing in FCFA

Cold-chain stack costs more than baseline truck GPS because of the additional sensors and the audit-export tooling.

Item	Range
Hardwired GPS device (with sensor inputs)	35,000-70,000 FCFA
Professional install	25,000 FCFA (more than baseline because of sensor wiring)
Cargo-zone temperature sensor (calibrated)	30,000-60,000 FCFA
Ambient temperature sensor	15,000-30,000 FCFA
Door-open contact sensor	10,000-20,000 FCFA
Cold-chain plan, per truck per month	9,000-12,000 FCFA
Audit export (per shipment, automated)	included in plan

For 10+ refrigerated trucks, Traxelio Enterprise provides custom contracts with calibration scheduling and SLA on alert latency.

Buyer's checklist

Cargo-zone temperature sensor with annual calibration support? Yes.
Door-open event logging with GPS-stamped events? Yes.
Ambient temperature sensor for context and door-event suppression? Yes.
Configurable excursion thresholds per cargo type? Yes.
Sub-minute temperature sampling rate available? Yes.
Sub-5-minute alert latency on excursion events? Yes.
Per-shipment PDF or CSV export with full audit trail? Yes.
API access for ERP integration? Yes.
Refrigeration-unit power-state monitoring (CAN bus)? Yes (subset of supported units).
Hardwired install with redundant power feed? Yes (mandatory for cold chain).
Calibration certificates per sensor unit? Yes.

Next steps

See the logistics & delivery industry page
Read the FR truck-fleet pillar for the broader logistics context
For tanker GPS (fuel / liquid transport with similar audit requirements)
For base truck GPS (no specialty cargo)
Cold chain typically goes through Enterprise sales: /enterprise or [email protected]

A 15-minute call walks through your cargo profile, sensor mix, and audit-export needs, then prices out a deployment.