well I look at the seconds (51) which means it's an X1which according to the chart is a Direct Hit! so we get D2 marked off. BUT if instead that was at 52 it'd miss low and hit D3.
Okay so I'm not sure if this is allowed, but I actually figured out how to sync up my shots with the board timer.
Based on a clock being allowed using the board timer is almost certainly even more allowed. I tend to use https://time.is/Which if it isn't allowed for the actual attempt the mods should likely tell me.