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I think Locus is displaying two maps at once.  That's been an issue I've noticed for years, usually (for me) noticeable by a darker forest color, caused by identical OAM content (from adjacent overlapping maps) being rendered twice.  In your case, it looks like those maps show different contour sets.  (OAM recently switched to higher-precision contour data.)

Because of this, I've had to turn off "automatic map loading", which otherwise would be extremely useful.  I hope Menion fixes this some day.

Hello Bruno
I realize that you are using LM4 as an app.

vector maps (mapsforge) are offered in the versions V3, V4 and the latest as V5.

In order to display the map details correctly, you also need the map theme that matches the version.

All LoMaps are currently only available in version V3 and therefore they only work with V3 themes as offered as default by Locus.

Which version of OAM maps do you use and with which map theme?

For me it is the other way around and the problem , the contour line problem only occurs with V4 maps.

I can generate the error when I zoom in or out between ZL15 and ZL18.

Wolfgang