it's sad to see sailors don't assimilate the concept of Thermal
I don't entirely agree with you. At sea, when we look at the coastline lined with cumulus clouds to confirm the sea breeze conditions, we say that 'the thermal is developing', that is to say that the breeze will soon establish itself in the afternoon. Even if the knowledge of sailors on the thermal is not so thorough, they know at sea the reasons for the coastal breezes.
For those who sail on lakes in mountainous regions, the thermal is a very good indicator of the coming mountain breezes on these lakes. But it is still necessary to know very well the local winds direction, or to use high resolution models such as AROME or ICON-D2 on Windy on wider lakes.