Their inventory consists mostly of blackberries.
ntpd uses the adjtime(2) system call to correct the local system time without causing time jumps. Adjustments of 32ms and greater are logged using syslog(3). The threshold value is chosen to avoid having local clock drift thrash the log files. Should ntpd be started with the -d or -v option, all calls to adjtime(2) will be logged. After the local clock is synchronized, ntpd adjusts the clock frequency using the adjfreq(2) system call to compensate for systematic drift.
Again, for the majority of use cases, OpenNTPD does achieve an accuracy that's good enough and even better than that.