I figured this might be easier to understand with some examples.
Medkit Basic: Add Rating to Mental Limit
Assuming an NPC Paramedic with the following stats. Wil-3, Int-3, Log-4, First Aid-4. (Mental Limit = 14/3 = 5) Using Rating-2 Kit.
Rolling 8 Dice. Maximum of 5 Hits allowed. Modified to 7 by Kit.
First 2 Don't count as they are absorbed in threshold.
Most that can be healed is 4
So, if by some miracle all 8 dice were hits. A Maximum of 7 could be kept. And of those, only 5 are applied to actual healing. And the most # of Boxes that can be healed is 4 based on skill level.
The Average # of hits (almost 3) means we will likely see only 1 box healed.
Really the only reason to not turn on wireless is if you are under assault by deckers that might take over your medkit.
Medkit Wireless: Add Rating to Dice Pool & Mental Limit.
Now we get to better benefits.
Using the same Paramedic this time with a Rating-3 better kit & turned on wireless so now we throw 8+3= 11 Dice.
Limited to 8 total hits & of them only 4 can be healed but the extra 3 dice means getting to those caps might actually be possible sometimes and at least the average # of hits goes up to 4 for a total of 2 boxes healed. So the Medkit had some positive affect here.
Medkit Autodoc/Wireless: Rating x2 Dice, Rating = Limit.
Finally the autodoc, what most Shadowrunners will want to have on hand. For this, 2 Examples.
Rating-3 Kit to fit in a pocket. (Oversized Wallet in dimensions, maybe a large screen cell phone but thicker)
Throwing Ratingx2 = 6 Dice. Keeping a Maximum of 3 Hits. First 2 Hits absorbed in threshold. Healing a Maximum of 3 Boxes.
Rating 3 Kit would need 3 Hits to heal 1 box of damage. It will never heal more than 1 box of damage & that its uncommon to even hit that.
Rating 1-2 kits are useless for this method.
Rating-6 Kit to fit in a bag.
(I'm sure you've seen these, they are a smaller than a laptop but 2x as thick or more. Too big for a pocket but very small for a backpack.)
Now we get to a maxed out R-6 Kit in a bag.
Throwing Rating x2 Dice = 12. You get to keep up to 6 Hits & after the 1st 2 hits are discarded heal up to 4 Boxes. (6 Max Boxes would never be hit)
Average use of this method gets you 2 boxed healed.
Rating-3 Kits on Wireless are a good investment for anyone that already has solid Logic & First Aid levels as they are small.
For purely Autodoc functions you are going to want a Rating 5+ kit .
Then under the medkit/autodoc section it says you can do this untrained with Intuition -1 + device rating x 2. But does that mean you heal 0 boxes of damage as you're limited to "The maximum damage healable with the First Aid skill is equal to the skill’s ratng"?
RAI for me would be that you add the rating of the medkit to your skill for figuring out the maximum healed, but from what I'm seeing RAW is if you are unskilled you heal 0 damage.
Just realized where you were reading this.
Yeah, it is odd that for "Untrained" it seems to let you add Rating to First Aid skill v/s Dice Pool
I agree, I'd add a line to clarify that the "Limit" that they add to is both "Mental/Hits" limit and "Skill/Boxes" limit .
Another way to read it is that when doing it w/o skill that the only result you can get is to "Stabilize" the patient ?
Oddly, I just noticed that Pg 205 says First Aid can ONLY be used if you have a Medkit (Even if it has no supplies?) which is odd, never noticed that before.