Does my team have to have 4 members?

Yes. You can only participate in Coastrek as teams of four. If you need to recruit additional members, maybe try:

• Our Event Coastrek Facebook group (eg. Sydney Coastrek Facebook group)
• Our team vacancies page - at www.coastrek.com.au, select your event and choose 'Team Vacancies'

If you only have 1 extra, find three more friends and enter two teams, or train as a team and have the extra person as a reserve. Don't forget that Support Crew often contributes to the team just as much as the 4 trekkers!