Sekhmet
First Post
My reading of teleport suggests you need more than just a clear mental image of the surroundings. That gives you layout... but it doesn't necessarily give you location and you need a clear idea of both. Even 20 minutes of observing may not give you that. You don't even get to see any geographical landmarks unless he's standing right next to them either. You need more information.
Per Teleport, you have a 3% chance of off target teleportation. Scrying sets you at "very familiar". Reread the Teleport entry.
Teleport :: d20srd.org
SRD said:Familiarity
“Very familiar” is a place where you have been very often and where you feel at home. “Studied carefully” is a place you know well, either because you can currently see it, you’ve been there often, or you have used other means (such as scrying) to study the place for at least one hour. “Seen casually” is a place that you have seen more than once but with which you are not very familiar. “Viewed once” is a place that you have seen once, possibly using magic.
[MENTION=6669384]Greenfield[/MENTION] Thanks for the correction.
[MENTION=40109]Vegepygmy[/MENTION] As Dandu suggested, just because you can fix it or patch it up doesn't mean it isn't broken, and no amount of preparation and forethought can counter every trick a good player is going to throw at you. That is just a fact.