System Reference Document

RANGED DEFENSE MODIFIERS 

Situation

Defense Modifier

Defender has soft cover (bushes, glass door)

+1

Defender has partial cover (crate, car door)

+2

Defender has full cover (pillbox, trench)

+4

Attacker aiming

-2 for each Action the attacker has spent aiming up to a maximum –DM of twice your weapon Skill Bonus (i.e. -2 for Apprentice, -4 for Expert, -8 for Master). Aiming can only be used with firearms.

Defender running (moving 2 × Speed yards in one turn)

+2

Defender Prone

+2

Attacker using burst fire spray

-1 to -6

Poor visibility (partial light, glare, smoke or fog)

+2

Terrible visibility

+4

Attacker moving (attacker has moved at least Speed yards before attacking)

+1

Defender unaware of attacker's position

-6