by GreenLake » Thu Sep 29, 2022 7:27 pm
A sailor from the Midwest, whom I met in Texas, has sailed the San Juans more than once in his Boston Whaler, about the size of the DS but lacking a cuddy. Based on the reports of his experience, I would assume that the DS should do well among the islands.
You are correct to worry about tides. If you look at the forecast you'll see that tidal ranges are easily 12' but that of the two tide cycles, one may be much smaller. The key question is how will this translate into current? As you can see on the charts, the Sound is a rather complex system of communicating waterways, with some narrow spots (like Deception Pass) where small boats have no business, perhaps even at slack water. A quick search at Amazon shows that there's a local publication "Tidal Currents of Puget Sound: Graphic Current Charts and Flow Patterns" that might come in handy.
If you look at the wind forecasts over a few weeks you should get an idea of typical patterns. Generally, your issue may be too little wind, except in the Strait (where you can have the opposite problem). If you load an app like Windy, you can follow the evolution of the wind forecast throughout the day: you should be able to see a definite sea breeze developing each (sunny) afternoon. It progresses down into the sound and reaches its maximum in the early evening hours.
This kind of thing can be useful for planning if you are able to observe multiple forecasts in similar conditions to your planned travel season. You should also be able to get historical data on prevailing winds. For the sound, this should show that winds predominantly are either from the North or from the South, with other directions much less frequent. Make sure you get data for where you will sail and for the correct season or month.
While we are still on the weather: Amazon lists a book you can get "The weather of the Pacific Northwest". I'm not sure how useful you'll find it, but if anyone writes about regional weather patterns it should be in a book like that. But on Northern Idaho you aren't that far away, so you may know all of those things already.
Waves: the wave height is a function of both the wind strength and duration, as well as the "fetch": where wind blows along a channel for some period with some strength you get a certain wave height for that wind strength. If the wind is at an angle, or the channel starts close by, then there's not enough fetch and you get smaller waves than otherwise. (Because this is not the open ocean you wouldn't expect any swell).
Look at NOAAs marine forecasts, they give maximum wave heights. If you follow those for a few weeks you'll see that they rarely mention significant wave heights unless the wind is pretty strong and there's a "Small Craft Advisory" out.
You may have picked up a theme here: whenever I sail somewhere new I like to look not only at the day's forecast, but follow along for a few weeks ahead of time. That helps in getting a sense of what is typical for the area, and also how local weather patterns tend to evolve. That makes it easier to later use these forecasts to know when to stay off the water (or remain at anchor) and when there may be good wind for the purpose.
I don't have much of an idea about good places to sail to that allow camping or anchoring, but I know someone who took an 11' Mirror Dinghy to Blake Island from some spot along the Duwamish. He may have done that as a round trip for all I know. So, if you go for something like a mile, that should be an extremely safe choice of distance (as long as you are not trying to go against/across strong currents).
In Texas I've done stretches up to 50 miles in a DS, but with favorable and dependable winds. You'll probably find the Sound a bit more fickle but distances of a few miles should be OK, especially if you have an idea how the weather will evolve and a "Plan B" (such as an alternate destination) if the weather or tide doesn't serve.
What else might be different from lake sailing? Be sure you understand the Navigation Rules, especially those related to Vessel Traffic Separation schemes. You'll need some kind of motor to be positive that you won't be stuck in the path of some oncoming freighter...(or ferry). And I would invest in a portable VHF and keep that tuned to the proper Channels (plus 16).
There's probably a bunch more, let us know what other questions you come up with.
~ green ~ lake ~ ~