@gruver - Purple Pen does it by repeating the control circle/number if the flip/exchange is at a control, and a start triangle if not.
@Cristina - thank you! It seemed to go well on the day. The other fun quirk of this event was that the long course was added quite late in the process - one of our junior elites asked if there could be something longer than the 6km "long" course I'd planned.
The existing course was already doing two laps of the detail, so I simply added a map exchange at the final control and a third lap for the new-long course. This gave runners the option to change course at that exchange control, and either
- head to the finish and get a valid time on the H2, or
- grab the third map and do the H1.
It also meant people could compare splits between the H1 and H2 with AP's handy dandy common legs
The other advantage was that control collection was an absolute doddle, I think we had everything in in about 30 minutes. :)