[Elennore]

Вуаля:

'Can the Riders see?' asked Merry. 'I mean, they seem usually to have used their noses rather than their eyes, smelling for us, if smelling is the right word, at least in the daylight. But you made us lie down flat when you saw them down below; and now you talk of being seen, if we move.'
'I was too careless on the hill-top,' answered Strider. 'I was very anxious to find some sign of Gandalf; but it was a mistake for three of us to go up and stand there so long. For the black horses can see, and the Riders can use men and other creatures as spies, as we found at Bree. They themselves do not see the world of light as we do, but our shapes cast shadows in their minds, which only the noon sun destroys; and in the dark they perceive many signs and forms that are hidden from us: then they are most to be feared. And at all times they smell the blood of living things, desiring and hating it. Senses, too, there are other than sight or smell. We can feel their presence - it troubled our hearts, as soon as we came here, and before we saw them; they feel ours more keenly. Also,' he added, and his voice sank to a whisper, 'the Ring draws them.'

Думается, ангмарец не "вынюхивал" днем ни Гендальфа, ни Эовин на Пелленорских полях, потому как над ними стояла тьма из Мордора.

А что касается глюка насчет карт - так никто же и не говорит, что только объемные предметы "отбрасывали тени" в чувствах назгул! Карту они были вполне в состоянии воспринять, если, конечно, им ее показывали не при солнечном свете.