Passage Planning does not work for me.
Using on a laptop as I cannot find the function on phone.

I check that my start and end location are absolutely in the water.
EG Kiel to Medemblik, or even simpler versions such as Cuxhaven to Vlieland.
I ask it to calculate.
Several minutes later it comes back and says that a passage could not be found within 168 hours or some random number.
I can see the passage on the chart. I check the settings include motoring and sailing options.
I promise I am normally pretty good at problem solving tech issues but this one has me stumped.
Any helpful hints?