How Do Manual, Altitude and Position Hold Differ?

• Pilot input
• Attitude-assistance example, upper branch
• Position-assistance example, lower branch

Compare the same situation

PX4 describes these as manual modes: the pilot still uses the control sticks, while the autopilot provides different levels of help. The table asks the same question for each mode: what happens when the sticks are released mid-motion? This describes PX4 multicopters; other firmware may use different names or behaviour.

What does “hold altitude” mean?

Altitude mode does not freeze a drone at a point. When the sticks are released, the autopilot tries to maintain its estimated current altitude, but it does not actively brake horizontal position. Imagine a simulated drone already moving to the right: Stabilized keeps its body level but it keeps moving; Altitude keeps the body level and the altitude but it keeps moving; Position also creates horizontal corrections to stop and hold position. Altitude therefore sits between the other modes in the amount of automatic help.

Three-dimensional position means horizontal coordinates together with altitude, rather than simply “staying still on screen.” Position needs a reliable source for estimating location. PX4 documentation names GPS or a position fix; the actual positioning method depends on sensors and configuration. Losing that source may make the mode unavailable or unable to meet its position-hold promise.

Trace a simulation using shared criteria

In a hypothetical simulation, start each mode from the same state and apply the same wind disturbance; observe attitude, altitude, horizontal position and sensor status. There is no need to declare one mode “the safest.” Instead, record which quantity is held, which drifts and whether the mode has the required inputs. If the simulator reports invalid positioning, treat Position as not ready rather than assuming it still holds the point.

Tradeoffs and limits

More assistance reduces how much the pilot has to correct manually, but depends on more estimates. Stabilized relies less on horizontal positioning, but the pilot must manage altitude and drift. Altitude reduces the need to hold height but still needs horizontal control. Position is convenient for stopping in place but depends on positioning quality. Releasing the sticks does not turn control off: the loop continues to run under the selected mode.

Summary

Stabilized holds attitude, Altitude also holds altitude, and Position additionally holds location. Compare modes with the same inputs, sensor state and question—“which quantity is held?”—to avoid treating a mode name as a universal capability.