Index of Spells by SubSchool - Scrying

Invisible floating eye moves 30 ft./round.

You create an invisible magical sensor that sends you visual information. You can create the arcane eye at any point you can see, but it can then travel outside your line of sight without hindrance. An arcane eye travels at 30 feet per round (300 feet per minute) if viewing an area ahead as a human would (primarily looking at the floor) or 10 feet per round (100 feet per minute) if examining the ceiling and walls as well as the floor ahead. It sees exactly as you would see if you were there.

The eye can travel in any direction as long as the spell lasts. Solid barriers block its passage, but it can pass through a hole or space as small as 1 inch in diameter. The eye can't enter another plane of existence, even through a gate or similar magical portal.

Hear or see at a distance for 1 min./level.

Clairaudience/clairvoyance creates an invisible magical sensor at a specific location that enables you to hear or see (your choice) almost as if you were there. You don't need line of sight or line of effect, but the locale must be a known place familiar to you or an obvious one. Once you have selected the locale, the sensor doesn't move, but you can rotate it in all directions to view the area as desired. Unlike other scrying* spells, this spell does not allow magically or supernaturally enhanced senses to work through it. If the chosen locale is magically dark, you see nothing. If it is naturally pitch black, you can see in a 10-foot radius around the center of the spells effect. Clairaudience/clairvoyance functions only on the plane of existence you are currently occupying.

Spies on subject from a distance.

You can see and hear some creature, which may be at any distance. If the subject succeeds on a Will save, the scrying attempt simply fails. The difficulty of the save depends on how well you know the subject and what sort of physical connection (if any) you have to that creature. Furthermore, if the subject is on another plane, it gets a +5 bonus on its Will save.

1) You must have some sort of connection to a creature you have no knowledge of.

If the save fails, you can see and hear the subject and the subjects immediate surroundings (approximately 10 feet in all directions of the subject). If the subject moves, the sensor follows at a speed of up to 150 feet. As with all divination (scrying) spells, the sensor has your full visual acuity, including any magical effects. In addition, the following spells have a 5% chance per caster level of operating through the sensor: detect chaos, detect evil, detect good, detect law, detect magic, and message.

If the save succeeds, you can't attempt to scry on that subject again for at least 24 hours.

As scrying, but faster and longer.

This spell functions like scrying. Additionally, all of the following spells function reliably through the sensor: detect chaos, detect evil, detect good, detect law, detect magic, message, read magic, and tongues.