Re cell phone boosters: it’s not at all the same situation as picking up a shore-based signal when there’s nothing between you and the tower but water.
There is no signal present to boost in most areas in the Broughtons. No cell towers, and even where there is a cell tower, such as down south at Sarah Point at the entrance to Desolation Sound, there is basically little-to-no service in popular nearby anchorages such as Prideaux Haven and Melanie Cove. Thus the sight of boaters taking dinghies out into Humphrey Channel to try and get a signal....
If you look at the topography, boating up there is like boating between mountains....Pierre’s Echo Bay Marina advertises that cell service is available - it’s only at one spot at one building, and pretty iffy at that. No coverage on the docks.
A Garmin InReach is the best solution, as long as you don’t have to have a spoken conversation. They work everywhere! Otherwise, you will be investing in a Sat phone and pretty expensive airtime.