This challenge is part of The Lowdown Mission in Fortnite Chapter 2 Season 1. As every week during this season, you'll need to find a hidden letter on the map, once you have validated 8 other challenges of the mission, as well as the affiliated loading screen.
The illustration will be your only clue to find the letter. If you really don't want to squint to look for the little character, we give you below the exact location of the T. All you have to do is grab your glider!
Map
To find the letter N, you'll have to set sail for the E.G.O. outpost located southwest of Holly Hedges. These militarized bases are at the heart of this week's challenges — logical then that the weekly letter quest send us straight to them.
The letter N is located exactly at the top of the iron stairs, near the two plastic drums.