In reply to DM1LE:
Hi Stephan,
Yes, a long dah is often used for zero - maybe two or three times the length of a standard dah. I am sure everyone will understand when you send them in the SOTA reference.
On the subject of dahs, you missed the first one off my callsign when we worked on 7th June. It made a change to be logged as being in the USA. I am often logged as R4OIG. Maybe I need a long dah at the beginning of my call, Hi!
73, Gerald G4OIG