An EKF source parameter holds a value that is not allowed

What ArduPilot says:

• Check EK3_SRCN_POSZ
• Check EK3_SRCN_YAW
• Check EK3_SRCN_VELXY
• Check EK3_SRCN_POSXY
• Check EK3_SRCN_VELZ

The EKF, ArduPilot's position and attitude estimator, is told where to take each quantity from: horizontal position (EK3_SRCn_POSXY), horizontal speed (EK3_SRCn_VELXY), height (EK3_SRCn_POSZ), vertical speed (EK3_SRCn_VELZ) and heading (EK3_SRCn_YAW), in three sets (n is 1, 2 or 3). The message names the parameter whose value does not fit that quantity. All three sets are checked, not only the one in use. The heading is always checked, the others when a position is needed.

What to do, most likely first

1. A parameter file from another aircraft or an older version was loaded, or the value was typed by hand.

   CheckRead the named parameter and compare it with what is allowed: POSXY 0, 3, 4 or 6; VELXY 0, 3, 5, 6 or 7; POSZ 0, 1, 2, 3, 4 or 6; VELZ 0, 3 or 6; YAW 0, 1, 2, 3, 6 or 8.

   FixFor an aircraft with GPS, compass and barometer use the defaults: EK3_SRC1_POSXY 3, EK3_SRC1_VELXY 3, EK3_SRC1_POSZ 1, EK3_SRC1_VELZ 3, EK3_SRC1_YAW 1.

2. A second or third source set was filled in only in part.

   CheckThe digit in the message is 2 or 3.

   FixGive that set valid values too. A set you do not use can copy set 1.

Parameters to look at

Where to do it:Starting ParametersParameter Compare & Migrate