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Old 11-10-2017, 10:39   #1
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Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
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Sweep Plot & PDS (would it help AIS CPA?)

This is one of Sean's Plugins. It was updated and completed awhile ago. The documentation is updated too. The plugin has changed from Trim Plot thus Sean renamed it. A wide range of Speed, Course and Wind parameters are graphed historically, using a new meaningful concept PDS

To Quote Sean:
Position Determined Speed
- PDS finds the speed of the vessel by comparing current position to the position from the past. For example PDS10 (10 seconds) takes the position 10 seconds before and determines the vessel speed by taking the distance from where it was then.

This method filters the data, giving a much steadier reading,
but also shows a comparison of useful speed traveled rather than the immediate GPS speed. Consider autosteering that is over or under dampened, or the case of large waves, even with an ideal autopilot. This will cause the boat to not travel in a straight line, but in a S curve. The GPS speed with read higher than the PDS position determined speed.

The new Sweep Plot Plugin Documentation is here

I wondering if a PDS filter would help with AIS CPA?
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Old 01-05-2018, 18:33   #2
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Re: Sweep Plot & PDS (would it help AIS CPA?)

Sean has updated this plugin with a change of name to "Plots_pi" and other improvements. There is still a "Sweep" option in preferences.

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