The present invention allows an existing single-sequentialized navigation main unit to be virtually multi-sequentialized with simple structure. The vehicle wheel idle station tooling apparatus includes a center pilot and at least one rim block. An availability monitoring server periodically queries the central manager to obtain the stop and start events, and analyzes the event data to determine time periods in which the databases are unavailable. When the likelihood is higher than the threshold value, an average value of the likelihood for detection over N times is derived.