Solving the Jigsaw Puzzle

Most of the significant navigational challenges along the Inside Passage (i.e., Strait of Georgia, Cape Caution, Dixon Entrance) are solved the same way. You wait for the weather to settle down, either the wind or wave height (often both since wind is the main driver of wave height), and go for it.

Halfway up Vancouver Island, however, is a challenge that requires putting together multiple factors. Coming down from the northend of Vancouver Island is Johnstone Straight. Coming up from the southend is the Strait of Georgia. Where they meet are a multitude of islands between the Vancouver Island and the mainland joined by several fiord like inlets that penetrate the mainland. There is a lot of water sloshing through here creating a dozen or so named rapids with tidal currents that will change from as high as 13 knots (about 15 miles per hour) in one direction to 13 knots in the opposite direction over a period of six hours.

The winds play a factor as Vancouver Island is a major impediment to weather systems. The channels between the islands and inlets jutting into the mainland become the routes of choice for the winds associated with the high or low pressure areas moving between the Pacific Ocean and the North American continent.

When the direction of the often strong winds oppose that of the often strong currents, the waves created by the wind will become short in period and steep. Travel in those conditions will become difficult, unpleasant or, at times, unsafe. If the winds and current move in the same direction, however, you can speed along relatively comfortably several knots higher than your normal cruising pace.

Figuring out a route, there are three main routes with several variations, becomes a puzzle of monitoring the weather forecast and timing the currents through the various rapids. We've traveled through here thirteen times (either north or south) and the exact route we take is seldom known until a day or two before we actually do it.

This year's trip involved taking the middle route through the Octopus Islands then using Mayne Passage to switch to the eastern route closest to the mainland. The final leg, a fourteen mile section in Johnstone Strait before cutting up into the more protected waters of the Broughton Archipelago was a bit of a bash in 20-25 knot winds opposing current.

We hope to round Cape Caution in the next day or so and complete the second half of the route to Ketchikan and little more expeditiously than the first half.