"Tracking" means the process of maintaining a record of the physical location of a SmartBus vehicle.
a. bus location, speed and direction from Real-Time tracking data
Comment – "tracking" is defined as physical location. This may mean using GPS location, vehicle speed and door state to deduce a reliable physical location, but this is defined elsewhere as bus position. The bus is tracked by dead reckoning if the GPS signal is bad
Real-time data (bus location/tracking data, time reference data for time-stamping of all SmartBus events, and the provision of this location and time reference data to external systems as required)
Comment - One could argue from this that the bus tracking data (a two minute record of position, which includes location, speed and door state) need not be provided to external systems as required, as much of it is no longer real-time. The use of "location" is confusing.
There are some aspects of a specification which are merely sloppy - some of these are reported, such as three different ways of referencing the same standard in the one document:
5.29 The tow motor shall comply with the operating requirements of SAE ARP 1247C
5.80 The tow motor shall be designed to conform to the maintenance requirements of ARP 1247C.
5.105
The tow motor
shall be designed to the human engineering requirements of SAE 1247C.
Sloppiness reduces the amount of information the reader can absorb, and it means that key word searches are likely to fail, so it has a cost.