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GPS Sensor Tracking Service

Offline GPS distance tracking at 97% trip-meter accuracy

A Kotlin Android study that computes distance travelled from filtered GPS fixes and the Haversine formula — no map or Directions API. Road-tested at 97% versus a vehicle trip meter.

Kotlin
GitHub

Abstract

GPSSensorTrackingService measures distance travelled using only the device GPS in offline mode. Fixes are filtered and summed with the Haversine formula. On a 2.00 km road route the app measured 1.94 km — 97% of the vehicle trip meter.

Problem

Field-survey and mileage apps that depend on routing APIs fail offline and often disagree with the dashboard.

Solution

A speed-aware tracking service that samples GPS, filters low-quality fixes, and accumulates Haversine segments. The repository publishes the road-test numbers and residual-error analysis.

Architecture

  • Kotlin tracking service bound to the GPS sensor.
  • Speed-aware sampling and accuracy filtering.
  • Haversine accumulation; no external routing.

Capabilities

  • Offline distance calculation.
  • Road-test methodology versus vehicle trip meter.
  • Transparent accuracy reporting (97% on the published route).

Audience

Field-survey, logistics, and insurance mileage products that must work without a map vendor.

Outcomes

  • An evidence-backed accuracy study, not a marketing claim.
  • Design input for Plugin.Maui.GeoLocator and OfflineSync field stacks.

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