In the answer to this question it is determined that, RAW, a cleric only needs the 100gp of divinatory tools and a component pouch to cast Find the Path.
The text to Find the Path includes
This spell allows you to find the shortest, most direct physical route to a specific fixed location that you are familiar with on the same plane of existence.
Using the RAW answer linked above, how does a Cleric become familiar with a location? Do they have to visit it? Hear about it? See it in a divinely-inspired vision? See it through a magic mirror, or a mundane spyglass? How do we define being familiar with something and where exactly is the line where something becomes familiar?