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» Online Classroom   »   » Public Discussion of Marine Radar   » RADAR Sim 3.0 being set by a current (or wind)

   
Author Topic: RADAR Sim 3.0 being set by a current (or wind)
TomD


 - posted December 28, 2009 01:10 PM      Profile for TomD           Edit/Delete Post 
I'm on chapter 10, parallel indexing. I would like to simulate a scenerio whereas my vessel is being set by a current in both HU and NU modes in order to get a real world feel for tis type of situation. Is there a configuration option or workaround in RADAR Simulator 3.0?

Tom

From: Oregon
David Burch


 - posted December 28, 2009 03:15 PM      Profile for David Burch           Edit/Delete Post 
We do not have anything packaged for this, but you can mock it up, i believe, in a way that will illustrate what you want.

Namely, using a blank chart set up 4 target vessels that are on the corners of a rectangle that is say 0.25 miles by 1.0 miles. Think of these as buoys marking the corners of a channel 1 mile long that is 0.25 miles wide, which is the channel you have to practice going through by radar alone.

Locate the buoy closest to you a few miles off to the NW... to make things more interesting.

to simplify discussion, orient the rectangle N-S, so that your channel is running due north-south. The speed of the 4 targets would be 0.0 to start with.

Then practice driving your boat by radar alone through this channel with the 4 targets having speed = 0. This is the No current case.

Then to practice in current, make each of the buoys (your 4 target vessels) moving say toward 135 at 0.5 kts. this will appear on radar as if the buoys were stationary and you were in a current of 0.5 kts toward 135.

etc.

To make the parallel indexing more interesting, note that you do not need both sides of the channel marked.

then you have enough targets to mark just one side of the channel and have a bend in then channel that you must turn at, and so on.

Does this make sense?
--david

From: Starpath, Seattle, WA
David Burch


 - posted December 28, 2009 03:30 PM      Profile for David Burch           Edit/Delete Post 
Here are a couple pics to get started, and in doing this i noted that it is best to use a "large" vessel for the target as they show up better from a distance.

 -

then this is what the radar looks like

 -

You may want to have the channel be narrower than this one.

and here, after practice, you can just follow one side of a channel with bends in it with something like this:

 -

Remember for the parallel indexing the entire run of your channel has to be on the same range setting, so you have to match your buoys to that....

another way to look at it, is find a challenging channel on a real echart, then set some waypoints on it, to see how you would then mock it up on the radar trainer.

another real world factor is that in this mock up the current always goes one way, whereas in the real channel where you use this the current will likely follow the channel shape with hopefully less cross channel offset.

however the turns are the tricky parts and this should give you good practice at that.

====================

Hopefully this meets your needs for the moment. If you would like to pursue this topic further, please register for our online radar course and we can work more examples and go into it more. See Starpath Radar Course

From: Starpath, Seattle, WA
TomD


 - posted December 28, 2009 04:51 PM      Profile for TomD           Edit/Delete Post 
Thanks for the workaround and the effort in coming up with this solution. It makes perfect sense and easy to setup for practice.

Cheers,

Tom

From: Oregon


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