Let me try again to explain the function of this slider control.
First, a key point. The slider applies to zoom operation dynamics, not to static chart selection.
I show some test shots here:
1. base.jpg. Note the scale is 78,200. Weight slider is 0.
2. zoom_1_click_with_weight0.jpeg. Here I have zoomed in by one click on the mouse wheel
. Note the new scale 39100.
I zoom back out by one click to produce "base.jpg" again.
I then set the weighting slider to (-5), and zoom in by one click again.
3. And you see zoom_1_click_with_weight_minus5.jpeg
Note the scale is the same as (2), ie 39100. But the chart shown is different. It is a smaller scale chart on (3). Note the change in zoom factor. (2) is zoom factor 0.5. (3) is zoom factor 2.0
You say, "Why would I want this?"
Answer: If your screen resolution is large, and the pixels small, you may find the image (2) to be too fine, or too detailed, to read clearly. So (3) is better for you.
On the other hand, if you have a small, low resolution monitor
, you may prefer (2), since (3) may be too coarse.
The important things are:
1 The slider affects zoom-in operations most directly.
2.It was not intended that a user exercise this control very often. Maybe experiment
, set it to your liking for average charts
in your area, and leave it set.
In effect, we pose this question:
"On zooming in, when do we switch to a smaller scale chart if available?"
-5...delay switching to smaller scale to improve performance and visibility.
0....As OCPN always was, default
+5...Switch sooner to a smaller scale chart, if you want more detail.
That's it. I don't know how this translates to French sensibilities. But I am sure you will give it a good try.