Using Carpool - use the closest town as your destination. For example, if you are going to the Broken Group, use Ucluelet or Tofino. Toquart Bay will not register :)

Zeballos should work for Nootka trips
Port McNeill for Broughton & Johnstone Strait
Tofino & Ucluelet for Clayoquot

You'll have lots of space to explain where you are going and what you are doing.