But you realize why I'm calling BS on the strict RAW here... for a mere 12k you can make ANY vehicle invisible... like say a massive BATTLESHIP.
On sensors, but still not completely. You can give a -6 to their Perception + Sensors check, but they're going to get a +3 (RAW) for the vehicle being that large. Any skilled person checking the sensor suite will notice a vehicle not actively evading detection.
Also I find the chameleon coating problematic also. Yes it means people have a -4 to see it... but you're in the middle of the sky... with no cover whatsoever... so there's positive mods as well there... and anyone with perception 3, int 3 still has 2 dice min. Throw that out across the number of people who can see a flying object and there's bound to be a lot of spots. So it's not the same as your infiltration expert rolling his stealth pool (and penalizing the spotter... which in itself is an extremely bad mechanic... yeah I need you to make a perception check with a -4 dice penalty!... as opposed to make a perception check (no clues why)... then roll against them with a +4 dice from equipment). But this is going far off the OP's thread base so I'll stop there.
First off, you can use infiltration with vehicles to maintain a stealth trajectory. See sensors in SR4A, so you can use your infiltration and have the chameleon coat modify the any observers perception just like a ninja in a chameleon suit would act.
That said, a -4 penalty to visual observation might not fool a trained observer, but keep in mind what skill levels mean. If you aren't using a skill every day, you aren't going to have it at a three usually since that's the professional level. A normal person would be closer to INT 3 and Per 1 or 2, meaning either no dice or one die for the check. To top that off, they get another penalty if you aren't immediately near them (-2 or 3) and another penalty if they're doing anything other than observing in detail (-2 distraction). All together, that's a -8 or -9 unless you're right next to them and if they don't have dice left, they get no roll at all without spending edge.
This actually makes giving penalties better than giving a bonus, since penalties can mean an auto failure while bonuses will never equal auto-success (but an auto failure on the observer can mean auto-success for the sneaker). Keep in mind that RAW actually suggests having GMs roll everyone's Per checks.
