MAVLink messages update Thu May 15 02:14:09 UTC 2025

Author: PX4BuildBot

en/messages/common.md

@@ -85,7 +85,12 @@ errors_count4 | `uint16_t` | | | Autopilot-specific errors
 
 ### SYSTEM_TIME (2) {#SYSTEM_TIME}
 
-The system time is the time of the master clock, typically the computer clock of the main onboard computer.
+The system time is the time of the master clock.
+
+This can be emitted by flight controllers, onboard computers, or other components in the MAVLink network.
+Components that are using a less reliable time source, such as a battery-backed real time clock, can choose to match their system clock to that of a [SYSTEM_TYPE](#SYSTEM_TYPE) that indicates a more recent time.
+This allows more broadly accurate date stamping of logs, and so on.
+If precise time synchronization is needed then use TIMESYNC instead.
 
 Field Name | Type | Units | Description
 --- | --- | --- | ---