Endeavor: Deep Sea · Board game rules
Can the Journal Action be used as an Additional Action?
Quick answer
No, the Journal Action replaces activating a Specialist, not an additional action.
Details
The Journal Action is performed by placing a disc from your Staging Area into the Journal's activation circle, which substitutes for activating a Specialist during your turn [p.12 — JOURNAL]. This means you cannot use a Journal Action as an "additional" action beyond your normal Specialist activation; it is an alternative use of your turn.
When you publish a Journal, its Action effect allows you to spend a disc to perform the specified action (e.g., Travel, Dive, Conserve) instead of activating a Specialist. The action is resolved as described on the Journal, and no Specialist is activated that turn. Discs placed on Journals remain there permanently and are not reclaimed during Reassignment [p.12 — JOURNAL].
Watch out:
If you activate a Specialist and perform multiple actions (due to the Specialist having multiple non-slash-separated actions), you still cannot use a Journal Action in the same turn. Journal Actions are strictly a replacement for Specialist activation, not an add-on.