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Yes, you can do it from the head unit in any vehicle. Just to remind you though - the purpose of writing on a printout in this case is not just to say “Oops” and give some lame excuse, the aim is to correct the erroneous entry and show that you were on Rest from whatever time you finished duty. You will do this by drawing a line in the chart area on the back of the printout through the appropriate times. Don’t forget to make two such printouts. Hand one in and keep the other with you for 28 days, then bin it.