Crafting guide for the GPS, PDA and Cell Phone in Terraria! Includes how to get all 13 items required and how to combine them in order (crafting tree).
As of now the GPS is only functionally available on console and PC, and the rest (PDA and Cell Phone, along with their other components) are only available since the 1.3 update which is coming very soon to Xbox One and PS4, likely to be included in the upcoming Nintendo Switch version, and then later should also be coming to mobile platforms (IOS and Android).
If you're on Wii U, Xbox 360 or PS3 you can still get the GPS at least, but unfortunately on 3DS and some other platforms none of this will work.
Crafting recipes:
GPS = Compass + Depth Meter + Gold or Platinum Watch
Fish Finder = Fisherman's Pocket Guide + Weather Radio + Sextant
Goblin Tech = Stopwatch + DPS Meter + Metal Detector
R.E.K. 3000 = Tally Counter + Lifeform Analyzer + Radar
PDA = GPS + Fish Finder + Goblin Tech + R.E.K. 3000
Cell Phone = PDA + Ice or Magic Mirror
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