With Improved Sniping
Benefit: You take only a -10 penalty to your Stealth skill instead of -20 when sniping.
and Stealth Skill Unlock
With sufficient ranks in Stealth, you earn the following.
5 Ranks: Reduce the Stealth penalty from sniping by 10.
Does that make the penalty for sniping 0? Or are they both competence bonuses and cancel each other out?
The way it could be read is that with Improved Sniping you take only a -10 penalty instead of the -20 and then with the skill unlock it reduces the penalty by 10.