Thank you Wiretwister, Redboxer and everyone else for your comments, i stand to be corrected, this is then a new version of the seimens tachograph, the you tube clip is much easier to understand than the sheet they gave me containing 21 different button movements to add and prefix entries.
The ? symbol on the video clip (redboxer) is new to me. Do i therefore use this instead of rest symbol for rest days/holidays?
This procedure may seem very easy to those who use all every day but an old boy like me who knows only how to drive, like a computer it takes a while and repetition to understand it.
Cheers Banquo