Moss does not indicate north, and two other methods do
The shadow stick
Mark a stick's shadow tip, wait fifteen minutes, mark again. The line between the two marks runs roughly west to east.
The night sky
Find the Plough, follow the two end stars five times their separation, and that is the pole star. Within about a degree of true north.
Why not moss
Moss grows where it is damp and shaded, which depends on local shelter far more than aspect. On a north-facing slope it is everywhere.
