If I have a character with a naval enhancement in melee, can I declare that character as an attacker/defender on a challenge that does not involve me?
Melee and Naval Enhancements
No. Per the Naval Rules only the attacking or defending player can use the Naval Enhancement to add characters to a challenge.
Naval is a type of challenge enhancement that is represented by a
ship symbol (=). Any time after an attack is declared,
the attacking
or defending player can kneel a non-participating character with
a = enhancement on the matching challenge icon and declare it
as a = attacker or defender in that challenge.
Edited
by doulos2k