The ECG function is available on the Garmin Venu 3 (45 mm), however the ECG is not recorded continuously during an activity, but only shows the current heart action when the ECG app is started manually. The result of the ECG measurement can then be analysed in the Garmin Connect app and exported as a PDF. Automatic or continuous ECG recording during sporting activities is not provided.

There is conflicting information in the search results, but the more credible and up-to-date sources confirm that the ECG function is enabled, but not as a continuous measurement during activities, but as a punctual measurement on demand. Other sources that indicate a missing ECG function are apparently outdated or refer to earlier firmware versions.