In Tears of the Kingdom, players will want to spend time revealing Hyrule's map on the Purah Pad. As a result of The Upheaval, the Sheikah Towers have all vanished from the surface. Instead, Tears of the Kingdom has Skyview Towers. Activating the Skyview Towers is the only way to scan a region of the map for both The Surface (Hyrule) and the Sky Islands.
Once players complete the tutorial mode, they'll be sent back to the surface of Hyrule. Like the Sheikah Towers from Breath of the Wild, there are 15 Skyview Towers in every region of Tears of the Kingdom. Before players rush off to the nearest tower, they will need to find the paraglider.
Understanding Skyview Towers
When Link reaches the surface, players should hurry towards the objective marker on their map. This will take them to Lookout Landing, where they will reunite with Purah. After speaking with her, go north to trigger another series of events (main quest: Crisis at Hyrule Castle). Then, return to Lookout Landing and rest at the shelter. On the next day in-game, Purah will have Link scan the map from atop the Lookout Landing Skyview Tower. She'll also give him a paraglider, which will absolutely come in handy for the rest of Link's journey.
Instead of climbing Skyview Towers, Link needs to interact with the Terminal. This will unlock a Travel Point that he can warp back to any time he wants. Then, step into the middle of the Tower and press A-button. This will launch Link into the air where he will then scan the tower's respective regions. After that, he'll free fall, so players will have the opportunity to use the paraglider to land on one of the Sky Islands, or he can Dive towads the surface.
Even if Link doesn't have to climb the Skyview Towers, most of the Terminals are locked behind puzzles. Speak to anyone near the Skyview Towers to get a hint about fixing the Terminal. Since Link will be free-falling once he's launched from the tower, it won't be possible to scope out his surroundings (press down on R-stick) unless he lands on a Sky Island beforehand.
Every Skyview Tower in TotK
With 15 Skyview Towers, players will spend a handful of hours tracking down every last one of them. It should also be noted that the Skyview Towers are not in the same places as the Sheikah Towers. The Towers that are located in the Gerudo and Hebra region have harsh weather that will chip away at Link's health. It's better to activate those when Link has weather-resistant gear or Chilly/ 
Spicy Elixirs.
While players have (mostly) complete freedom of where they can go, it's best to start activating the towers closest to Lookout Landing.
Lookout Landing Skyview Tower
Coordinates: -3686, 2342, 0233.
How to Activate: This Skyview Tower doesn't have a puzzle. It's part of the main quest, Crisis at Hyrule Castle. Lookout Landing's Tower essentially serves as a tutorial to the remaining 14 Skyview Towers.
Hyrule Field Skyview Tower
Coordinates: -0753, -1019, 0064
How to Activate: While this is the closest Tower to Lookout Landing, it's in the middle of a Bokoblin Fortress. The best way to get in is to take care of the ones on the ground, then climb up the fortress and wait for the three by the front gate to charge at Link. Then, head for the tower quietly to avoid waking up the other monsters.
Popla Foothills Skyview Tower
Coordinates: 0602, -2118, 0098
How to Activate: Drop down the nearby well, and players will find the man that was sent to fix the Tower's Terminal. It appears he fell for a trap and is now stuck below ground. To free him, Link will need to step on the switch on the other side. So, Ascend to exit the well, then enter the nearby cave at 0585, 2232, 0051. Free the NPC, and he'll give 50 Rupees as a reward.
Sahasra Slope Skyview Tower
Coordinates: 1345, -1169, 0166
How to Activate: First, enter Sahasra Slope Cave (1326, -1156, 0138). Head deeper into the cave until reaching 1341, 1177, 0131. From there, Ascend to enter the Tower, and then remove the two poles blocking the door. If Link's inventory is full, then switch to Ultrahand and remove the poles this way.
Rabella Wetlands Skyview Tower
Coordinates: 2422, -2761, 0223
How to Activate: Build a roof along the scaffolding with nearby wooden planks over the thorns at the door and then burn the roots with a 
Fire Fruit (or 
Flint). It's always raining here, so don't bother waiting by a fire to pass the time. Use the Hudson Construction materials and do away with those thorns.
Mount Lanayru Skyview Tower
Coordinates: 3845, -1306, 0539
How to Activate: Wear cold-resistant armor (level 2) before attempting this tower. This Skyview Tower is surrounded by columns of ice, and trying to climb them will be futile. Instead, look around for falling ruin pieces. Then, climb onto the ruins piece and use Recall to bring it back into the sky. Once Link is high enough in the air, jump down and glide towards Mount Lanayru's tower.
Pikida Stonegrove Skyview Tower
Coordinates: -2304, 3066, 0433
How to Activate: Use the nearby planks and attach them to the broken bridge with Ultrahand. Alternatively, players can use fire (ie: set up a campfire) and ascend with the paraglider to the ledge with the broken bridge.
Typhlo Ruins Skyview Tower
Coordinates: 0338, 3123, 0174
How to Activate: Ascend onto the floating ruins, and use Ascend and the 
Rockets to "climb" towards the Skyview Tower's summit. Some ruins may be out of reach, so switch to Ultrahand to pull them closer. At the top of the tower, use Ultrahand to remove the block from the lid.
Eldin Canyon Skyview Tower
Coordinates: 1636, 1183, 0226
How to Activate: This is the only Tower in TotK that Link will have to climb. If he starts running out of stamina, stand on one of the ledges. Bring Stamina Elixirs too, just in case. At the top of the tower, drop down the roof and use the paraglider before Link hits the floor.
Rospro Pass Skyview Tower
Coordinates: -3684, 2343, 0233
How to Activate: Equip cold-resistant armor to ward off the harsh weather. Then, use a Fire Fruit or Flint to burn away the thorns. Unlike the Rabella Wetlands Tower, players don't need to create a roof over the door.
Upland Zorana Skyview Tower
Coordinates: 2855, 0582, 0379
How to Activate: Clear away the sludge that's blocking the door by tossing a Slash Fruit. There's also a nearby Zora by the steps of the tower who's drowning in sludge. Drop a splashfruit on him to complete a side quest.
Ulri Mountain Skyview Tower
Coordinates: 3493, 2019, 0188
How to Activate: Fire an arrow at the Aerocude to make it drop the terminal, then use Ultrahand to place the terminal inside the Tower. It's recommended to have at least one arrow on hand. If players are struggling, then get close enough so that they can ZL-target the Aerocude.
Gerudo Highlands Skyview Tower
Coordinates: -3966, -1260, 0426
How to Activate: Enter Meadela's Mantle Cave at -3996, -1257, 0427, then use a plank of wood to sail down the river and waterfall. Eventually, Link will find four posts sticking out of the water. Use Ultrahand to move the plank in the middle of these four posts. Use Ascend to break into the tower.
Lindor's Brow Skyview Tower
Coordinates: -1901, 1243, 0297
How to Activate: Create a bridge with the planks from the nearby Hudson Construction using Ultrahand. Then, rotate it by holding down R-button and tapping whichever direction on the directional pad. Finally, lean the planks against the tower.
Gerudo Canyon Skyview Tower
Coordinates: -2423, -2202, 0302
How to Activate: This involves fixing the elevator so that repairs can be done on the Tower's Terminal. Attach a metal box to the metal cube hanging from the elevator at -2395, -2138, 0273. There are boxes and even wooden planks at the Hudson Construction right next to the Tower.
The Legend of Zelda: Tears of the Kingdom is available for Nintendo Switch.