Why couldn't Sauron see?

[rudeboy]

When Frodo puts the ring on at the Seat of seeing he is almost caught by Sauron's gaze, so why does he put it on again a few moments later to escape to the boats, surely Sauron will be still searching the area? Surely he would be caught? Also Sam puts it on in or on the outskirts of Mordor, Gandalf warned them about wearing it, but it didn't seem to be that dangerous, as Sauron couldn't find them when he had nailed down the area and even in or outside Mordor!

[Sapphire_Flame]

Without any clear purpose he drew out the Ring and put it on again. Immediately he felt the great burden of its weight, and felt afresh, but now more strong and urgent than ever, the malice of the Eye of Mordor, searching, trying to pierce the shadows that it had made for its own defence, but which now hindered it in its unquiet and doubt.
~~The Lord of the Rings: The Return of the King Book XI, Chapter 1: The Tower of Cirith Ungol

Abedithon le,

~*~Aranel~*~

[Oroaranion]

i seem to remember reading somewhere that gandalf explains that he used a spell of some sort to divert or hinder the gaze of the Eye. i could be wrong though

[dancing spawn of ungoliant]

Yep, I recall reading something like that too. Or then it's my wild imagination...

[Firefoot]

"The Ring now has passed beyond my help, or the help of any of the Company that set out from Rivendell. Very nearly it was revealed to the enemy, but it escaped. I had some part in that: for I sat in a high place, and I strove with the Dark Tower; and the Shadow passed. Then I was weary, very weary; and I walked long in dark thought." -Gandalf, in The Two Towers, Chapter V, The White Rider

Another thing is that at about the time Frodo and Sam entered Mordor that Sauron was waging war against Minas Tirith, Lothlorien, and the Dwarves of the Lonely Mountain. His efforts were concentrated there; and he thought that someone in Gondor had the Ring. He was not looking to his own lands."Wise fool. For if he had used all his power to guard Mordor, so that none could enter, and bent all his guile to the hunting of the Ring, then indeed hope would have faded: neither the Ring nor bearer could long have eluded him. But now his eye gazes abroad rather than near at home; and mostly he looks towards Minas Tirith. Very soon now his strength will fall upon it like a storm." - Gandalf, in The Two Towers, Chapter V, The White Rider His doubt will be growing, even as we speak here. His Eye is now straining towards us, blind almost to all else that is moving. -Gandalf, in The Return of the King, Chapter IX, The Last Debate

[rutslegolas]

ya i agree with all the replies .
but i also think that the dark lord could not see frodo when he put the ring again while escaping the boats because he was not as high up when he was on the high seat so the eye of the dark lord could not catch him.

just a guess maybe it can be wrong?