Telematics and the live vehicle data plane

In short

Where vehicle position and state actually come from — phone-as-sensor versus installed hardware, ping frequency and cost, geofences, and how to store and render a live map that stays honest at fleet scale.

4 pages

definitions

Breadcrumb trail: the line driven, not the line plannedThe trail is what the vehicle reported. The route line is what someone intended. Quoting one when you mean the other is how a mileage or detention dispute gets lost.definition6 min
Geofence: a zone, 3 triggers, and the hysteresis that stops it lyingA zone on a map is not a geofence. It becomes one when a trigger rule and a hysteresis policy are attached, and without the second it fires whenever a parked vehicle's fix wanders.definition6 min
Ignition on and off: 1 true signal and its 4 false versionsEvery telematics feed carries an ignition flag. Whether it means the engine is running depends on how it was obtained, and the field itself almost never says.definition6 min
The 8 fields in a position report, and the 2 that make it trustworthyA coordinate pair on its own proves almost nothing. The 8 fields around it decide whether a position is evidence, and 2 of them decide whether the other 6 can be believed.definition6 min

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