Hello!
Please clarify what you mean. Is this the function you are referencing?
What menu are you referring to? Screenshots would likely help explain the situation better. Perhaps you mean these options?
I assume you mean the map in my first screenshot. In that case: Navigraph provides the images that make up the map in the background. The addon developer (iniBuilds, in this case) is responsible for:
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Showing the map, placing the images correctly (we provide tools for this, but some developers - including iniBuilds - have chosen to do things themselves)
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Switching between presets (IFR, VFR, Day/Night etc.)
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Showing your live position
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Rendering anything on top (routes, highlights or any other layers)
If I understand you correctly, you are asking for such a “layer on top”. This would be a feature request for iniBuilds, Navigraph can’t help you with this unfortunately. Please let me know if I have misunderstood your question!
Kind Regards,
Malte

