Code identifying the Standard Carrier Alpha Code

ISD01 is the Standard Carrier Alpha Code (SCAC) corresponding to the first carrier in the route defining the service commitment.

Code specifying the Standard Point Location code defined by National Motor Freight Tariff Association (NMFTA) or the Canadian Transportation Agency (CTA) point development group as the official code assigned to a city or point (for ratemaking purposes) within a city

ISD02 is the location of the event.

Code identifying the event about which a report is made

Time expressed in 24-hour clock time as follows: HHMM, or HHMMSS, or HHMMSSD, or HHMMSSDD, where H = hours (00-23), M = minutes (00-59), S = integer seconds (00-59) and DD = decimal seconds; decimal seconds are expressed as follows: D = tenths (0-9) and DD = hundredths (00-99)

ISD04 is the latest time that the event described in ISD03 may occur.