Does anyone else use Atomic Clock Sync
 

This handy little (free) programme shows the exact exact time and seems to match exactly whatever timekeeping system BA uses. OLCI can be efected at T-24 to the millisecond !

Am I being dense here? What programme?

There's really no need as the functionality is built into Windows, Mac OS X etc so that your PC can synchronise with time servers on the Internet which are themselves synchroised to an atomic clock. For the purpose of OLCI, that's far far accurate enough!

Oh? Maybe your experience of OLCI is different to mine as I have found that on many occasions I have had to wait a few hours after "T-24" to OLCI.

Time sync (network time protocol / ntp) is a service built into windows XP and vista, if you're using another version of windows, look at tardis ( http://www.kaska.demon.co.uk/tardis.htm )

then choose a 'nearby' time server, windows usually defaults to its own time server which is quiet busy and in many cases 'far enough' network wise to introduce some delay and possible errors.

A list of timeservers around the world are on : http://www.pool.ntp.org/zone/@

to change your local time server in windows, double click on the clock in the corner right hand side then choose internet time tab. sync and enjoy.