Not sure where this question properly belongs. It's about Indirect Fire from Total Warfare, but relates to how the Jumping Jack SPA affects it, which is from Campaign Operations.
In Total Warfare rules for Indirect Fire, if the Spotter moves, they add a penalty for this movement to the Target Number for the firing unit.
Total Warfare, pg. 111:
All standard modifiers for attacker movement and a modifier for the spotter’s movement
So, if a Spotter jumps, it would apply a +3 modifier to the Indirect Firing unit's Target Number.
However, if a MechWarrior on the spotting unit has the Jumping Jack SPA, from Campaign Operations, does this affect the penalty for spotting?
Campaign Operations, pg. 76:
The Jumping Jack SPA reduces the normal +3 to-hit attacker movement modifier for using Jumping movement with a +1 modifier.
Jumping Jack changes the penalty for Jumping from +3 to +1. This affects all the MechWarrior's attacks, but does it also apply to the penalty a spotter contributes to a unit firing LRM's indirectly?
If a spotter with Jumping Jack jumps on the turn it is spotting for another unit, does that unit suffer an additional +3 penalty, or just a +1 penalty?