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Old 29-05-2022, 03:08   #1
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Join Date: Aug 2018
Location: Dartmouth, Devon, England
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Savvy Navvy - where's the key?

I'm new to Savvy Navvy, and it seems pretty good. But I cannot find the key anywhere on their site, or anywhere. So, I can't understand the risks etc. Here's an example - the recommended route is marked on the chart, but some of it is dashed in red, and some in yellow. I've not idea what that means.

I'm also aware there is a longer and deeper channel on this stretch of river - but it never plots that route as an alternative whatever the state of tide. This strikes me as strange: if red/yellow lines are a warning, it should show the safer plot, right?.
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Old 03-06-2022, 22:30   #2
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Re: Savvy Navvy - where's the key?

As best I can make out from some quick messing around, the yellow is apparently used to indicate "not enough wind to sail" and red to indicate passing over water shoaler than your draft. You should be able to adjust those parameters in the settings for your vessel.

It's an interesting app; I might play with the web version a bit more to see how it handles some messier tidal cases.

As to safety, I suggest caution when using do-it-for-you apps for navigation. One should never assume there's anything "safe" about an auto-computed route.

This looks like a useful tool for incorporating weather and tide, but ultimately you are responsible for the route you sail. Your evaluation of that route should be done using the best available data; that can certainly include consulting 3rd party charts as a 2nd opinion, but should always include up-to-date official charts.
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