How do I postpone or abandon a race before the starting signal?

Question

Accepted Answer

Under rule 27.3, before the starting signal the race committee may for any reason:

postpone the race by displaying flag AP, AP over H, or AP over A, with two sounds; or
abandon the race by displaying flag N, N over H, or N over A, with three sounds.

What the signals mean (race signals page):

AP: races not started are postponed. The warning signal is made 1 minute after removal unless at that time the race is postponed again or abandoned.
AP over H: races not started are postponed, with further signals ashore.
AP over A: races not started are postponed and there is no more racing today.
AP over a numeral pennant 1-9: postponement of 1-9 hours from the scheduled starting time.
N: all races in progress are abandoned; return to the starting area. The warning signal is made 1 minute after removal unless at that time the race is abandoned again or postponed.
N over H: all races in progress are abandoned, further signals ashore.
N over A: all races in progress are abandoned, no more racing today.

Source: Racing Rules of Sailing 2025-2028, rule 27.3 and race signals page, https://cdn.revolutionise.com.au/site/ofeyzh6cn3tumfga.pdf