At the information/registration point establish how long should be allowed to reach the start. Set off in time (remembering that call up might be 3 or 4 minutes before your start time. The route to the start is usually indicated by short tape streamers). Sometimes different starts are used for different courses. Take care.
When your start time is announced (or you are ready to go on "turn up and go") present yourself to the official, who may remove the small stub from your control card or check that your electronic "dibber" has been cleared of previous data. A start is usually in several stages. On leaving the last marked line, collect the preprinted map and set off.
The time span shown on event details shows the range of start times available.