Knowledge base

Guides for people who actually fly

Everything here comes from the same place the app does: the conditions that decide whether a flight is a good idea, and what to do when they change while you are already in the air.

Latest guide

Safety 11 min read · Updated 2026-09-04

ATTI mode: what it really is, and the acro myth

ATTI is not a rescue switch and it is not FPV acro. It self-levels, it holds altitude, and it will not flip — but it will drift until you fly it. The difference decides how you react.

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More guides

Weather 8 min read

Wind at altitude — why the ground forecast lies

Ten km/h at your feet can be thirty at 100 m. How the wind gradient works, why gusts matter more than averages, and how much headroom your drone actually needs.

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Camera 7 min read

ND filters and the 180° shutter rule

Why your video looks stuttery in bright sun, how shutter speed ties to frame rate, and how to pick the right ND strength for the light you are actually standing in.

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Weather 6 min read

The Kp index — when a solar storm reaches your compass

Geomagnetic activity degrades heading reference before it degrades position. What Kp measures, the threshold where pilots start seeing it, and what to do on a bad day.

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Safety 7 min read

Cold-weather flying and the voltage-sag trap

A cold pack reports a healthy percentage and then collapses under load. Pre-heating, the first-minute rule, condensation on the way back indoors, and realistic winter margins.

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Rules & airspace 10 min read

Reading airspace before you take off

Controlled airspace, restricted zones, temporary restrictions and the difference between "you may not" and "you must ask". How to read the map instead of guessing.

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Safety 8 min read

Return-to-home is not a parachute

How RTH actually decides its route, the altitude setting most pilots get wrong, and the four situations where pressing it makes things worse instead of better.

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Safety 6 min read

The pre-flight check, and why each line is on it

A checklist you skim is decoration. The short list that actually catches problems — and the reasoning behind every item, so you remember it when you are cold and in a hurry.

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Gear & data 9 min read

Reading your own flight log after a scare

The telemetry your controller records is a black box. Which channels matter, how to spot the moment things went wrong, and what the log can and cannot prove.

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Safety 9 min read

GPS jamming, ATTI mode and how to fly out of it

A drone that loses its satellite fix does not fall out of the sky — it becomes a different aircraft. What interference does, how to recognise it in the air, and the measures that bring it home.

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Reading about conditions is one thing. Seeing yours is another.

Fly4cast puts wind at altitude, airspace, interference reports and a flyability score on one screen, for the spot you are standing in.

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