Method for tracking a path taken by a vehicle

A method for recreating a path taken by a vehicle on a journey, the method comprising:

• a) retrieving a data packet compiled during said journey;
• b) retrieving an initial location from said data packet;
• c) retrieving an initial displacement vector from said data packet;
• d) determining a current location based on said initial displacement vector and said initial location;
• e) repeating steps e1)-e3):
• e1) retrieving a difference vector from said data packet;
• e2) determining a current displacement vector based on said difference vector and an immediately preceding displacement vector;
• and
• e3) determining a new current location based on said current displacement vector, and an immediately preceding location.

Computer readable media having encoded thereon computer readable instructions which, when executed by a data processing system, implements a method for logging a track travelled by a vehicle, the method comprising:

• a) determining an initial location for said vehicle;
• b) storing said initial location in a data packet;
• c) after a predetermined reporting time interval, determining a subsequent location for said vehicle;
• d) determining an initial displacement vector for said vehicle based on said initial location and said subsequent location;
• e) storing said initial displacement vector in a data packet;
• f) at predetermined reporting time intervals, executing steps f1)-f4):
• f1) determining a new location for said vehicle;
• f2) determining a new displacement vector based on said new location and an immediately preceding location;
• f3) determining a vector difference between said new displacement vector and an immediately preceding displacement vector;
• and
• f4) storing said difference vector in said data packet.

Computer readable media having encoded thereon computer readable instructions which, when executed by a data processing system, implements a method for recreating a path taken by a vehicle on a journey, the method comprising:

• a) retrieving a data packet compiled during said journey;
• b) retrieving an initial location from said data packet;
• c) retrieving an initial displacement vector from said data packet;
• d) determining a current location based on said initial displacement vector and said initial location;
• e) repeating steps e1)-e3):
• e1) retrieving a difference vector from said data packet;
• e2) determining a current displacement vector based on said difference vector and an immediately preceding displacement vector;
• and
• e3) determining a new current location based on said current displacement vector and an immediately preceding location.