Altimeters,
Unless something has changed recently, Qantas long haul does not have relief Captains, usually just a Captain, FO and two SO. The FO is command qualified for in-flight relief.
The Captain logs PIC.
The FO logs co-pilot, unless he is the pilot flying, when he/she logs AICUS.
The SOs log co-pilot time.
If that has changed recently (its been as above since 1970s, from memory) some one will let us know.
Tootle pip!!