If I know the whereabouts of a person who has a warrant for their arrest. Is this considered aiding and abetting?

Although I do not practice law in the State of Florida, here are my initial impressions.  I think it is unlikely that you could be arrested solely for knowing a person's location.  However, if you have engaged in any other conduct that facilitated this person alluding the authorities, then you may have been exposed to some criminal liability.  I suggest consulting with a local attorney to discuss this matter in greater detail in the interest of protecting your rights moving forward.  Good luck.