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Old 11-01-2025, 02:14   #1
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OpenCPN, O-Charts and RPi: dangerous omission

I recently purchased O-Charts 'Netherlands and Belgium 2025', downloaded with the O-Charts dongle and used both on my pc (OpenCPN v5.6 as wel as a v5.10), and on my Rapsberry Pi (OpenCPN v5.6).


Now there is a glaring difference between both screens (pc versus RPi), see two attachments.
The first (left) is a screenshot from my pc, the other (right) from my RPi system.


On the pc screen there is correctly displayed a strict no-go area, obviously important when navigating (see the large rectangular cardinal-buoy marked area).


Now on my RPi screen this area is not shown.


Since my RPi is my main navigation tool I consider this a grave error and would like to know how this needs to be resolved.


Note: the O-Charts on my RPi were correctly downloaded and installed, and get displayed when the O-Charts dongle is inserted.


Please help me?
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Old 11-01-2025, 02:35   #2
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Re: OpenCPN, O-Charts and RPi: dangerous omission

First thing to check would be the display category, in the bottom right menu. Try all >




AI generated but not doubl checked, should be right though >

Quote:
Answer
The Display Category menu in OpenCPN is a crucial feature for controlling the level of detail shown on vector ENC (Electronic Navigational Chart) charts. This menu is located in the Chart Panel Options, accessible through the Hamburger icon (three horizontal bars) in the lower right corner of the chart canvas1.
Functionality and Options
The Display Category drop-down menu becomes active when vector ENC charts are displayed. It offers four main options:
Base: Shows the minimum set of chart objects required for basic navigation.
Standard: Displays the IMO-accepted minimum safe set of objects for navigation.
All: Presents everything in "Standard" plus additional information, making it ideal for new users and daily navigation1.
User Standard: Equivalent to the IHO-accepted "Mariners Standard," allowing advanced users to customize the displayed objects1.
Usage Guidelines
New Users: It's recommended to use the "All" category for navigation to avoid potential risks and confusion1.
Daily Navigation: The "Standard" mode is suitable for most users during regular navigation1.
Advanced Users: The "User Standard" mode offers flexibility but should be used cautiously as it can potentially omit critical information1.
User Standard Mode
When using the "User Standard" mode, users can customize the displayed objects through the Vector Chart Display settings:
Located in Options > Charts > Vector Chart Display
Allows selection of specific object classes to display
Includes buttons to reset to standard settings, select all, or clear all objects1
Important Considerations
In "User Standard" mode, if an object class is not enabled, it will not be displayed, which can create potentially dangerous situations1.
The "Base" category always displays certain safety-critical items, such as obstructions, wrecks, depth contours, and underwater rocks1.
The selected Safety Contour is always shown in "User Standard" mode1.
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Old 11-01-2025, 02:57   #3
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Re: OpenCPN, O-Charts and RPi: dangerous omission

Hi @barcoMiCasa, yes the 'All' tab is and was selected.


Unselect and reselect does not alter the result.
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Old 11-01-2025, 03:32   #4
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Re: OpenCPN, O-Charts and RPi: dangerous omission

That's odd then

Though quite old versions of opencpn, 5.6, it's 5.10 now. Shouldn't make any difference though...
Definitely the same charts?, looks like it but to double check if you hover the mouse over the green bar at the bottom of the screen it should pop up with which chart is being viewed.

Another thing to try, turn on chart quilting by pressing the Q key or in the right hand menu, the bottom bars have more rounded corners when quilting is on, looks like it might be off on both images.



Chart quilting is a feature in OpenCPN that allows the display of multiple charts together on the screen, seamlessly redrawn to the same scale1. This functionality enhances navigation by providing a continuous and comprehensive view of available chart data.
Key Aspects of Chart Quilting
Automatic Chart Selection: When zooming in or out, larger or smaller scale charts are automatically displayed if available1.
Continuous Coverage: Panning reveals a continuous quilt of available charts, eliminating the need to manually switch between charts1.
Projection Compatibility: Quilting works with various chart projections, including Raster Mercator, Raster Transverse Mercator, Raster Polyconic, and Raster skewed charts1.
Separate Quilting: Raster charts and Vector charts are quilted separately. You can quilt either raster or vector charts, but not both simultaneously3.
Benefits of Chart Quilting
Increased Information: The amount of relevant information on the screen increases significantly compared to single chart mode3.
Seamless Navigation: Charts are automatically available as you move across different areas, eliminating the need to manually switch charts3.
Improved Situational Awareness: By displaying multiple charts together, users can better understand their position relative to surrounding areas.
How to Enable Chart Quilting
Go to Chart Panel Hamburger → Display Options → Enable Chart Quilting
Or select MenuBar → View and check Enable Chart Quilting
Alternatively, use the "Q" shortcut key to toggle quilting on/off1
Chart quilting is a powerful feature that enhances the navigation experience in OpenCPN by providing a more comprehensive and seamless view of chart data
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Old 11-01-2025, 03:37   #5
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Re: OpenCPN, O-Charts and RPi: dangerous omission

What happens if you zoom in to the same level on the Rpi?
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Old 11-01-2025, 03:45   #6
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Re: OpenCPN, O-Charts and RPi: dangerous omission

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Originally Posted by Recy View Post
What happens if you zoom in to the same level on the Rpi?
Nothing, zooming does not affect the problem.
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Old 11-01-2025, 03:47   #7
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Re: OpenCPN, O-Charts and RPi: dangerous omission

Are the Zoom Detail settings the same? The "d" short cut key. What happens if you modify those of the RasPi?
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Old 11-01-2025, 03:49   #8
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Re: OpenCPN, O-Charts and RPi: dangerous omission

Is there a reason why your are using OCPN 5.6 still?
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Old 11-01-2025, 03:49   #9
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Re: OpenCPN, O-Charts and RPi: dangerous omission

What I don’t get is that the chart without that marked area has many other markers that are not on the other chart.

Logic dictates that these are different charts…
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Old 11-01-2025, 03:54   #10
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Re: OpenCPN, O-Charts and RPi: dangerous omission

What do the Meta Data of the active chart say? Hovering with the mouse over the corresponding entry of the chart bar below.
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Old 11-01-2025, 03:59   #11
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Re: OpenCPN, O-Charts and RPi: dangerous omission

Quote:
Originally Posted by s/v Jedi View Post
What I don’t get is that the chart without that marked area has many other markers that are not on the other chart.

Logic dictates that these are different charts…
which quilting off would explain.
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Old 11-01-2025, 03:59   #12
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Re: OpenCPN, O-Charts and RPi: dangerous omission

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Originally Posted by brice3010 View Post
Nothing, zooming does not affect the problem.
pressing the Q key change anything?
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Old 11-01-2025, 04:00   #13
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Re: OpenCPN, O-Charts and RPi: dangerous omission

Quilting is active - observe the rounded corners of the chart bar rectangles.
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Old 11-01-2025, 04:18   #14
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Re: OpenCPN, O-Charts and RPi: dangerous omission

Quote:
Originally Posted by bcn View Post
Quilting is active - observe the rounded corners of the chart bar rectangles.
Looked square to me but zoomed in seems so. Could try try turning it off and looking at the other charts on the ribbon on the Pi, see what's there
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Old 11-01-2025, 10:14   #15
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Re: OpenCPN, O-Charts and RPi: dangerous omission

So many thanks for all these replies!! I had been out for the afternoon, and currently my Pi system is doing some extensive work prohibiting me from doing any OpenCPN tests. Tomorrow morning I will report back with results, thanks again for all your support!
Erik




PS: I use 5.6 because last week I had made an upgrade to 5.8 and OpenCPN kept crashing on startup; this is for another day to try out.
And as someone here said, it should not make a difference; also I have two systems on my pc: v5.6 and 5.10 both doing fine on pc. So this seems to be a RPi related issue.. or else the charts on the Pi that are not right.
Have a good night and until tomorrow morning, cheers.
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