Slitherine

Hi,
I have played my first FOG:N game and could not find in the rules the exact definition for line of sight in assaults. To be specific: what is the arc of sight of the units/bases? Is it 90°or 180?

Thank you

Line of sight is all round. However, a unit cannot wheel more than 90deg when making an assault.
It also cannot assault a unit that it can't see from its starting position.

thank you