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Old 24-12-2010, 11:26   #1
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OpenCPN Chart Problem

I not sure if its something i'm doing wrong or a bug but when I display the Key West area of Florida the largest scale chart I can see is 1:18000 but there are other charts down to 1:10000 available for that area. It actually shows the outline of these charts but will not show them even if I rightclick and click the "Max Detail Here" or click the "Shift to Larger Scale" button. This is the new version 2.3

Attached is a screenshot with the cusror on largest chart button.

Thanks
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Old 24-12-2010, 12:03   #2
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What operating system are you running? If it's Windows it has to be something you're doing wrong. I had no problem displaying the Key West Harbor chart, 1:10000, 11447. Have you confirmed that 11447_1.KAP is in your active charts directory?

Fabbian
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Old 24-12-2010, 12:12   #3
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Works for me... Win 7 - 64bit
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Old 24-12-2010, 12:39   #4
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However, I do note an issue. Actually I noticed this in the last beta, but never got around to posting it.

Sometimes when viewing CM93 charts, it will switch to ENC and the CM93 button on the chart bar disappears. Below is an example.
  1. Viewing CM93. Zoom in on Key West, right in the center of the screen. I am using scroll wheel with the option to center on zoom.
  2. Momentarily, the detail CM93 chart displays (I couldn't catch that), then it switches to ENC and the CM93 button disappears. But you can see the chart outline of the detail chart (faint green line starting under the "Grib" button, goes down, then left). I have tried repositioning the screen, and extreme zoom in/out, but nothing makes the CM93 button reappear as long as I stay in that area.
  3. Click on an area outside the green area to reposition the chart and the CM93 button reappears.
  4. Without another reposition, click on CM93 and the detail appears.
-dan
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Old 24-12-2010, 12:55   #5
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I think I figured out what the problem is. It seems openCPN will only display a maximum of 20 charts for one place. Once you go over the 20, it starts dropping the the ones with most detail. I took out all the pilot charts from the directory and now it works fine.

Seems to me if there is a limit, it should drop the charts with the least detail like the world chart and pilot charts.
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Old 24-12-2010, 13:03   #6
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Quote:
Originally Posted by phiggins View Post
...
Seems to me if there is a limit, it should drop the charts with the least detail like the world chart and pilot charts.
Yep. Especially if the detail chart is in the middle of the screen.
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Old 24-12-2010, 13:08   #7
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So do you think that is a bug Dave?
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Old 24-12-2010, 14:11   #8
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Guys,
the 20 chart limit is actually a feature. The feature we don't like and probably has to be changed. The hard part is to decide how to change it. There already was some discussion on the forum suggesting how to approach the chart management when the pilot charts were calibrated and we started to auto-calibrate some weather charts, but to come with a solution that works for everybody will be quite hard I would say...

Pavel
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Old 25-12-2010, 02:48   #9
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I think that this must be treated as a bug.
An unaware user with two sets of Pilot Charts loaded for example can, come into the situation where the normal navigation charts are suddenly unavailable. The situation would of course arise when coming into an area with overlap between the two sets of Pilot Charts.

The simplest quick fix for this, is to dump the smallest scale chart first, except for CM93.

I have added this piece in the documentation.
Quote:
Warning - Limitation
The Chart Bar handles a maximum of 20 charts. The largest scale charts will be dropped first if more than 20 chart are available on a position. Make sure that just the necessary "info" charts - pilot charts and weather charts - are loaded when under way, otherwise essential large scale charts may not be visible.
Thomas

PS Added to the tracker FS#316 : Navigation Charts may become unavailable.
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Old 25-12-2010, 08:02   #10
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Could this be the same issue I have noted:

Can't Get ENC to Show

?
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Old 25-12-2010, 11:39   #11
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To me it sounds very similiar. I couldn't get any ENC charts either until I removed all the Pilot charts. Now I get them.

I think many users may run into this problem if they did what I did and loaded all the Pilot charts.
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Old 25-12-2010, 18:36   #12
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Phiggins, et al....

Greetings and Merry Christmas from Staniel Cay....

As a simple test, we may increase the chart stack limit in chartdb.h

Code:
#define     MAXSTACK          20
Modify this line, to something like 30, and recompile.

Is it a bug? Yes, I think so. In the US, with all NOAA ENCs, RNCs, cm93, and pilot charts, we can clearly exceed 20 charts in the stack. The limit of 20 was established early on to safely bound the stack size, and facilitate array bounds checking. Nothing magic about 20.

ktcanuck....
re your problem, I cannot find any obvious problem from the logs you kindly sent. So, count the chart selection bar boxes. Are there 20 showing when you exhibit the problem?

Bandwidth challenged, but loving the latitude....
Dave
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Old 26-12-2010, 02:39   #13
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Complex chart selection

The following has been reported on a French forum and replicated
- Load a very large scale (c. 1/20 000) .kap 'chart' from google map made with ChartAid
- Load CM93
Everything runs fine (pic #1)
-Now load a bunch of .kap (SHOM) charts at various scale (rather large to rather small: 1/50 000, 1/150 000, 1/2 000 000)
There typically will be 3 - 6 (at most) SHOM charts at one location
Select CM93 on screen as background, and hit at the Google chart on the bottom bar. Now The 'background' will shift from CM93 to the SHOM chart. (pic #2)
In other words, it is impossible to select CM93 as background + the very large scale Google .kap.
Pic #3 is a typical bottom bar. Leftmost is the very large scale Google .kap, then several SHOM charts at various scale, and CM93
While obviously non critical, this has been frowned upon by some...
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Old 26-12-2010, 04:31   #14
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Quote:
Originally Posted by sailorF54 View Post
The following has been reported on a French forum and replicated
- Load a very large scale (c. 1/20 000) .kap 'chart' from google map made with ChartAid
- Load CM93
Everything runs fine (pic #1)
-Now load a bunch of .kap (SHOM) charts at various scale (rather large to rather small: 1/50 000, 1/150 000, 1/2 000 000)
There typically will be 3 - 6 (at most) SHOM charts at one location
Select CM93 on screen as background, and hit at the Google chart on the bottom bar. Now The 'background' will shift from CM93 to the SHOM chart. (pic #2)
In other words, it is impossible to select CM93 as background + the very large scale Google .kap.
Pic #3 is a typical bottom bar. Leftmost is the very large scale Google .kap, then several SHOM charts at various scale, and CM93
While obviously non critical, this has been frowned upon by some...
What you describe is a feature, this is how quilting rastercharts works. There is no "background chart" as such, but CM93 is used in areas where there isn't any other coverage.
This is how the documentation puts it:
Quote:
Raster charts and Vector charts are quilted separately and don't mix together. You can quilt either raster charts or vector charts, but not both at the same time. The exception to this rule is that CM93 ver2 charts, if available, are shown if no other chart cover exists for a displayed area, for both raster- and vector- chart quilting.
Of course this is not set in stone, and can be changed. You may want to consider a feature request in the Tracker.
Thomas
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Old 26-12-2010, 04:59   #15
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I don't see this as a bug. If .kap charts will fill the entire display then the display should switch to .kap charts. If CM93 charts are displayed and a .kap chart is selected and there are no .kap chart(s) that fill the rest of the display then the .kap chart should quilt with the CM93 chart(s). The included pic is an example of this latter behavior.

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