Expedition Navigation Software 
1 of 1- DuncanR
- Expert
Offline - From: Up and down East Coast Aus
- Registered: 9/16/2015
- Posts: 470
Distance for calibration analysis
Is it possible to get distance between two wands from a Stripchart variable? I know one could do it in Expedition using dividers, but as I'm already pulling other values from Stripchart, it would be easier if one can.
- Navigator
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- Registered: 7/31/2018
- Posts: 64
Re: Distance for calibration analysis
You can set one Channel to Log Bsp or Log Sog.
And then use the "Wand Deltas" function. There it shows "Change Log Bsp", or "Change Log Sog"
- DuncanR
- Expert
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- From: Up and down East Coast Aus
- Registered: 9/16/2015
- Posts: 470
Re: Distance for calibration analysis
Nav, thanks for the quick reply. I'm aware of the delta function, but not Log BSP or Log SOG - and of course I can't add them retrospectively 
. What are they measuring?
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Thread Starter- Navigator
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- Registered: 7/31/2018
- Posts: 64
Re: Distance for calibration analysis
My guess is, that it's just integrating SOG or BSP. So, probably you can do that calculation with a short Python script and add it to the log file.
- Nick
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- Registered: 9/16/2015
- Posts: 2,964
Re: Distance for calibration analysis
You also get deltas for sog and cog based on the wands. You could use that to get the distance as you know the time.
- DuncanR
- Expert
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- From: Up and down East Coast Aus
- Registered: 9/16/2015
- Posts: 470
Re: Distance for calibration analysis
That works just fine Nick, course dist 385 nm, race dist as calculated SOG * Time = 403 miles. 7 tacks, 1 gybe, average TWA 115 degrees. A gentleman's race.
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