Sniffing it out

[Delenot]

A snippet from scent...

When a creature detects a scent, the exact location of the source is not revealed—only its presence somewhere within range. The creature can take a move action to note the direction of the scent. When the creature is within 5 feet of the source, it pinpoints the source’s location.

By reading this, if you have the scent ability you can pinpoint a creature of you move within 5' if it.

Here is my question: If you pickup a scent and don't move but instead ready an attack...can you attack as soon as the scented creature moves within 5' off you?

[Byakko]

Sure.

A creature with scent pinpoints all creatures within 5', assuming they're smell-able. You'll still have a miss chance, naturally, but you could certainly ready to attack the source of a scent if it approached within 5'.