D: Look on the back of the "CLUE 1" card for this digit.
You did save the "CLUE 1" card, right? (You're going to need it again later!)
OK. That's enough help for now.
(Scroll down for more clues.)
The only digit on the back of the card is "8", so the letter D should be replaced with the digit 8: N45°11.ABC' W88°23.8EF'
OK. That's enough help for now.