I regularly annotate airport plates and approach charts, etc. using the pen tool in Navigraph Charts. It’s a very useful feature.
However, there is no way to persist annotations between flights. I would like the option to have a persistence option to permanently (until manually deleted) associate annotations to any chart.
For example, NOTAMs can detail taxiway closures which will exist for several weeks or months. Instead of having to annotate an airport chart every time I plan a departure from an airfield, I can persist my comments until I no longer need them.
Regards
Rick