What happens to my maps when Training.gov.au updates a unit?
Short answer: Your maps stay attached to the outdated release of that unit unless you choose to update it.
See which release a map is attached to in the unit index:
When there is a new release of a unit, the release number (ie. 1.0, 1.1, etc.) will change.
When you continue working on a map that belongs to an outdated release of a unit, a notification bar will appear at the top of your screen to ensure you are aware that you are working with superseded data and have the option to update.
Once you have completed editing the map and click Save again, it's your choice to choose to update the map (change the release number) or keep it in the same old release: