Opinion ID: 2810129
Heading Depth: 2
Heading Rank: 2

Heading: TomTom’s Cayman Data

Text: Appellee TomTom, Inc.’s personal navigation devices (“PND”) use a “proprietary data format” called Cayman Data Format. Appellee’s Br. 13; J.A. 550. Cayman Data is essentially a GPS trail data record. According to TomTom’s expert, the data collection operates as follows: When a trip begins, the starting GPS latitude and longiTOMTOM, INC. v. ADOLPH 7 tude readings are recorded by the PND in the Cayman log file. J.A. 429–30. Subsequently, in either one- or fivesecond intervals (depending on the device model and the software it uses), the device records the absolute value of the change in position from the first reading, called a delta value. J.A. 429. It will also record subsequent changes in position, called a delta-delta value. J.A. 437; Appellee’s Br. 13–14. When either the trip is completed or the GPS signal is lost, the device stops recording deltadelta values. When a new trip begins, or the GPS signal is regained, the process starts over by recording new starting latitude and longitude readings and subsequent delta and delta-delta values. The Cayman log files remain on the device until the user either directly uploads the data over a cellular connection or manually connects the PND to a computer using a USB cable and uploads the files to TomTom’s servers in the Netherlands using TomTom HOME software. J.A. 430. In the Netherlands, the data is validated, analyzed, and merged. This postprocessed data is combined with historical traffic data obtained from other sources to create speed profiles for each roadway. J.A. 785, 814.