Post by iconPost by SxBoy | 2017-12-13 | 11:08:41

Hi im new to Zezo, and what you have done is amazing! Could anyone tell me what the square dot on the red, green and blue line is trying to tell me and also whats the difference between red and blue? Thanks

commenticon 10 Comments
Post by iconPost by HKG1203 | 2017-12-13 | 12:06:22
It Signifies where you will be at the time of the thich blue lines (cannot remember theiir proper names) if you were to go in a straight line or continue heading at the angle shown
Post by iconPost by zezo | 2017-12-13 | 12:27:28
Red / blue lines would be Rhumb Line(Loxodrome) / Orthodrome in nautical terms

Not sure how you'd call the green one, but it's where a wind-vane based autohelm would take you.
Post by iconPost by woffer | 2017-12-19 | 21:01:34
Am I not correct in assuming that the green line placed along the route will represent the TWA to get to the point at which the 2 lines intersect? And to you’re point Cvetan, this IS the way an autopilot could work.
Post by iconPost by zezo | 2017-12-19 | 21:05:08
The green line is path with fixed TWA/autohelm. You can compare the dots/circles against the isochrones for the red/green/blue lines and decide how to sail the distance. Sometimes a straight line is better than fixed TWA, sometimes it's the other way around.

Post by iconPost by woffer | 2017-12-19 | 22:14:04
Post by iconPost by zezo | 2017-12-13 | 12:25:08
The little squares instead of dots are supposed sail changes. Not exact, just there to remind you to be careful.
Post by iconPost by SxBoy | 2017-12-13 | 14:52:26

Post by iconPost by jpafonso | 2017-12-17 | 23:02:31
Cvetan, a question that never occurred to me before: If the constant heading in VR are Rhumb/loxodrome line, that means when I want to go to a certain point using that mode, I must try to coincide the red line with my destination, isn't that so?

After thinking for a time, I come to understand why you do that: to create a manageable symmetrical counter part to the fixed TWA tool line, i.e., you could put the red ending where the mouse pointer is, but that means you had to do the same thing with the green line for aesthetic and coherence reasons... and this is not only harder to calculate, it might be impossible in certain cases.

But this is something easy to overlook. I wouldn't be surprise if the majority confuses the trajectory they are planning with the blue line when they choose the (red) heading.
Post by iconPost by zezo | 2017-12-17 | 23:12:48
It's the blue line because it's the straight forward case. Mouse cursor gives direction, blue line gives great circle route to that point, red line gives you loxodrome in that direction.

It's possible to get a reverse calculation and plot a loxodrome anding at the position pointed by the mouse cursor, but now the angle is wrong. It looks more intuitive to me the way it is.

You can sail the blue line by using a game waypoint if needed. Place it at the approximate distance ahead, with boat heading the appropriate direction, no need to lookup coordinates.

Post by iconPost by Ursus Maritimus | 2017-12-17 | 23:15:34
indeed, you can see the heading that goes with the mouse cursor and blue line in the status bar at the bottom of VR Dashboard
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