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Old 08-10-2015, 09:56   #1
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Join Date: Dec 2013
Location: Sausalito, CA
Boat: Ericson 35 MKII
Posts: 32
Plugin for Current Speed and Direction (Set and Drift, or VDR)

Hi all, I've made a nifty little multiplexer with an Arduino that uses a few inputs and outputs the VDR sentence, which is Set and Drift. For anyone who wants to replicate it, the instructions and code are available for free on my personal blog here.

Here's a sample output in the San Francisco Bay:

My location:

And the output:

It's basically saying that at that point, the current should be flowing towards 255 True at a speed of 2.5 knots. My instrument says the current is 237 @ 1.89 knots (I discovered the error was because my heading sensor was skewed by about 15 degrees and I hadn't calibrated the compass).

But is there any way to plot the vector over my boat? Course Made Good and Speed Over Ground are plotted as a red long dash vector; Heading (True) and Speed Through Water are plotted as a red short dash vector; so is there a plugin out that that could plot the Current Set and Drift as a dotted line vector, or hollow line? Or any sort of vector?
TBillings is offline   Reply With Quote

current, plug

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