Tactics Plugin

[rgleason]

NAV these definitions are all very good I think. I do notice Bowditch calls CMG a "misnomer" and I am not quite sure why. I think our terminology page for the most part conforms to these, but I will check.

VMG is not covered, but Bowdich does have this
"velocity, n. A vector quantity equal to speed in a given direction. "
which is consistent with our understanding and terminology.

We just need to accept that VMG can be to a waypoint or to the wind.

[NAV]

In chapter 7 (DR) of Bowditch (see text para 707 en 708, and drawing 708c, the following terms are used for course and speed to be achieved (future):

• Speed to make good
• Course to make good

Together these 2 are: Velocity to make good

What is called Velocity made good (VMG; history) in the plugin, may be described more accurately as: the vectorcomponent, in direction of wind (or waypoint), of Velocity to make good.

The goal is to maximise the speed of the vectorcomponent, in direction of wind (or wpt), of Velocity to make good.

[NAV]

Attached is a document containing the international definitions related to nautical directions and speeds (see para's 5.1 to 8.2).

[J35M8]

For a nice discussion about VMG and VMC from the perspective of the racers among us.

Destination One Design - Preparation

[RogerD]

<"For a nice discussion about VMG and VMC from the perspective of the racers among us.

Destination One Design - Preparation">

This document confirms the modern around the bouys race course. If the course is set up correctly by the race committee, where is the first mark? Directly upwind from the start line.
Then where is the next mark? Directly downwind. Although the second leg may be a short offset leg at 90 degrees to the wind before heading directly downwind.
So, the wind and the waypoints are aligned.

It is only when they go "offshore" that the course isn't directly aligned with the wind and they get confused about the meanig of VMG.
As currently defined in the OpenCPN manual under
Activating and using routes

- "VMG Velocity made good to next waypoint".

Roger

[LeaseOnLife]

Instead of having a double meaning for VMG, how about using VPW, "velocity parallel to wind"

• It exists as valid NMEA 0183 sentence, at least some B&G systems use it.
  NMEA Revealed
• Before OpenCPN I used "seaclear" as PC nav-tool, and it displayed VPW
  https://books.google.com/books?id=n7...rallel&f=false

[nkiesel]

tactics_pi crashes O when using it at my computer w/o GPS input because mTWS and mTWA are NAN but passed to a "round" function.

I have a simple 3 line patch that fixes it but wonder if this is specific to my setup somehow.

[tom_BigSpeedy]

Thanks Robert,
acknowledged, I'll test & try to fix next weekend.

Thomas

[nkiesel]

diff --git src/tactics_pi.cpp src/tactics_pi.cpp
index b65df77..86f1bb3 100644
--- src/tactics_pi.cpp
+++ src/tactics_pi.cpp
@@ -4851,6 +4851,10 @@ use of any instrument or setting
 **********************************************************************************/
 void tactics_pi::CalculatePerformanceData(void)
 {
+  if (wxIsNaN(mTWA) || wxIsNaN(mTWS)) {
+    return;
+  }
+
   mPolarTargetSpeed = BoatPolar->GetPolarSpeed(mTWA, mTWS);
   //transfer targetangle dependent on AWA, not TWA
   if (mAWA <=90)

[tom_BigSpeedy]

nkiesel,

fix is implemented and uploaded to github.

I'll upload a package to Ricks file thingie in a minute or so.
This time virustotal does not report any issues ...



SHA256: 1774315131735cc9fe2fa8a186707536e5a705204a3133405c 9e8ddacc94e39d Dateiname: tactics_pi-1.0001-win32.exe Erkennungsrate: 0 / 57 Analyse-Datum: 2017-02-19 21:30:19 UTC ( vor 1 Minute )

Thomas

[J35M8]

T_BS,

Nice fix. I downloaded and installed the updated Tactics_pi on OCPN 4.5.213 and let the system run for 6 hours with no GPS or instrument input. This would crash every time before and now..... NIRVANA!

J35M8....

[tom_BigSpeedy]

Originally Posted by J35M8

T_BS,

Nice fix. I downloaded and installed the updated Tactics_pi on OCPN 4.5.213 and let the system run for 6 hours with no GPS or instrument input. This would crash every time before and now..... NIRVANA!

J35M8....

Does OpenCpn also crash when you run 4.5.213 with disabled plugin?
Or, in other words: try running the plugin with the last stable version of O, and not tha alpha version...
Thanks
Thomas

[J35M8]

T

I ran a short test with the Tactics_pi plugin disabled. O seemed stable. However, this was not a truely conclusive test, because it was with 4.5.214.

My other setup is still running 4.4 (latest release) but it is not a valid testbed for this case because it has a GPS connected and feeding sentences. It's also at home which makes running during the day a problem.

While I can't say conclusively that you have slayed the dragon, it sure looks good.

J

Originally Posted by tom_BigSpeedy

Does OpenCpn also crash when you run 4.5.213 with disabled plugin?
Or, in other words: try running the plugin with the last stable version of O, and not tha alpha version...
Thanks
Thomas

[tom_BigSpeedy]

J35M8,
I cannot reproduce your crashes... At least not with 4.4
I have O running here since 2 days nonstop with activated plugin but without any instruments connected. No problem at all ...

Can you pm me your opencpn.ini file and polar file if had loaded one ?

What are you doing exactly ?
Are you working on unix or Windows ?

Thomas

PS : since Jan 05 I can't compile OpenCPN itself anymore, I'm getting tons of linker errors. I already did a complete new installation and rebuilt everything from scratch, it didn't help. So I cannot debug against the latest 2.5.x betas...

[soeni]

Hello,

your Plugin is very interesting. I don have the whole development environment. is there a possibility to get the binary file? Perhaps via upload here in the forum?

Kind Regards