The problem with IF in Twilight2000 is that the authors were using very outdated information. The accuracy limits for IF are an example. The CEP (Circular Error, Probable) fell below the blast radius of most mortars in the early 90's. The key factors would be:
1. Does the FO know EXACTLY where he is in the world (say by GPS)?
2. Does the FO know the EXACT DISTANCE to the target (say because he used a laser range finder or ranging binoculars to measure it)?
If the answer to these two questions is "yes," then the target is in a heap of trouble because it is a fairly simple math problem to compute the target grid coordinates. I would propose the following rules for IF in Twilight:
-If the FO has a GPS (with signal), a Laser Range Finder, and can "pre-plot" his fire, then his chance to hit is EASY:FO.
-If the FO has a GPS (with signal), Stadiametric Ranging Binoculars, and can "pre-plot" his fire OR a Grid map and Laser Range Finder, and can "pre-plot" his fire, then his chance to hit is AVE:FO.
-If the FO has a Grid Map, Stadiametric Ranging Binoculars, and can "pre-plot" his fire, then his chance to hit is DIF:FO.
-If the FO has a Grid Map but no reliable method of "ranging" the target (he must "eyeball" it), and can "pre-plot" his fire, then his chance to hit is FRM:FO.
-If the FO has neither a Grid Map or a method of "ranging" the target, then his chance to hit is IMP:FO (whether he "pre-plots" or not).
"Pre-plotting" takes about 30 seconds. If the FO cannot "pre-plot" the fire, then the GM should reduce his chance to hit by one level, for calling fire "on the fly" (don't laugh at this, many good FO's could do that VERY well).
An FO who is forced to "guestimate" the range to the target due to a lack of equipment, can increase their chance to hit by one level with a DIF:OBSERVATION roll.
The to hit roll for the fire should be recorded and the difference between the chance to hit and the actual roll should be subtracted from the round's deviation roll. Missed to hit rolls should have the difference between the chance to hit and the actual roll ADDED to the round's deviation roll.
I also have a system for NPCs taking fire and maintaining combat flow. When you roll the number of hits from Fragmentation, you add this to any blast/concussion damage the round might do. Each DIE of Concussion and each frag HIT is compared to an NPC's CON value with the following results.
-If the NPC takes a number of concussion DICE + Frag HITS equal to his CON or less, he is still in the fight with a Slight wound.
-If the NPC takes 2 X CON in Concussion DICE + Frag HITS, he suffers a Serious Wound.
-If the NPC takes 3 X CON in Concussion DICE + Frag HITS, he suffers a Critical Wound.
-If the NPC takes 4 X CON in Concussion DICE + Frag HITS, he is killed.
This will help you quickly resolve artillery or heavy weapons fire into groups of NPCs and still allow the players the feeling that they are in control of the results of Indirect Fire during play.
|