If you fly a drone in Turkey, you've probably heard the name by now: İLTER.

İLTER is a domestic drone detection-and-denial system, developed by Boğaziçi Savunma, now deployed around "sensitive" areas — airports, military sites, government buildings, power plants. The way it protects those zones is brutal for anyone flying nearby: it jams your GPS and RC signals, and worse, it spoofs GNSS — feeding your drone fake satellite data so it believes it's somewhere it isn't.

Here's what that actually does to a hobby drone:

• Jamming → your DJI reads it as signal loss and triggers Return-to-Home.
• Spoofing → far more dangerous. The aircraft "thinks" it's over another city, calmly turns, and flies "home" to a point that doesn't exist. You don't feel it happen. It just… leaves.

And this isn't some rare edge case. Istanbul and Ankara are among the heaviest GPS-interference zones in the region — signal-loss events have climbed roughly 220% in the last few years. The sky over the exact places we love to fly is getting noisier and less predictable every season.

The part that broke me: it hits people doing everything right. Pilots in the Turkish DJI community have lost aircraft on fully permitted, legal flights — one watched a 40,000₺ DJI Inspire 2 fly off into a spoofed horizon, others their Mavics. You pay for the drone, the tax, the license, the flight permit… and still lose it. Then the second hit lands: confiscation, heavy fines, and insurance that won't pay because it happened near a "restricted" zone.

Almost all of it is avoidable — not by being a better pilot, but by simply knowing before you take off: the airspace, the wind at altitude, the no-fly zones, and the jammer spots. That's why I built Fly4cast — one clear pre-flight briefing instead of ten scattered tabs and a prayer.

But here's the honest problem

A weather API can tell you the wind. No official database will ever tell you where a jammer is. That knowledge doesn't exist on any map — it lives only in the memory of the pilots who already got caught.

The only way a jammer map becomes real is if we build it together. One pilot marks a dead-GPS spot; every pilot after them gets a warning. That isn't something a single developer ships. That's a community.

So this is the ask

r/fly4cast — and Fly4cast itself — is meant to be ours:

• 📍 Report the jammer spots and hazards you hit — help build the map no agency will
• 🧭 Share what saved your flight (or what didn't)
• 🛠 Tell us what's missing — features, drones, regions — and we build it
• 🧪 Help test it and shape it

Try it free in your browser at fly4cast.com, or grab the Android beta and fly with the briefing in your pocket.

A safer sky for hobby pilots isn't something one dev codes — it's something a community maps, together. If that's you, welcome home. 🚁

Introduce yourself below — and if you've ever been jammed or spoofed, tell us where. That one comment could save the next pilot's drone.