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Every day in the United States, an average of approximately two cyclists die in bicycle accidents. Sometimes, forensic engineers are asked to reconstruct these accidents. These cyclists may use bicycle GPS devices to record important data, which they use to monitor their riding activities. By analyzing this data, many questions can be answered regarding various parameters such as speed, position, and riding behavior of the bicyclist. The goal of this study was to analyze the accuracy of the GPS position and speed data. For this study, four different bicycle GPS devices (one of which was paired with a magnetometer Garmin Bicycle Speed Sensor), a GoPro camera equipped with GPS, and a smartphone recording to Strava, were mounted on a bicycle. The bicycle was ridden in an approximately straight line (back and forth), and then around a building, to measure positional and speed accuracy.

Fleet management companies have implemented tracking devices in their vehicles that employ Global Positioning Systems (GPS) in near real time for optimizing fuel consumption, smart routes, and for monitoring driving behavior. For this purpose, Geotab Inc. has developed the OBD-II connected Geotab GO device. These devices are capable of recording vehicle position and speed data using GPS. The present study seeks to validate and compare Geotab recorded data to data collected from a VBOX 3i RTK DGPS; this instrumentation will provide a reliable reference for vehicle position and speed. Additional data logging characteristics such as LTE connectivity, Geotab’s proprietary curve logging algorithm, near-real-time vehicle data, and speed interpolation were analyzed. This study considered two Geotab models, the GO8 and GO9. Both devices were connected in parallel using two sets of two-way splitters connected to the test vehicle’s OBD-II port.