Not really a good idea.
First of all: There are crew members that have a job of spotting shit around the ship, but in the end it's yours job as a captain and a player to keep an eye on them and make a correct decision.
Second: IIRC this game is supposed to be realistic more or less not some arcade game like World of Warships were you have everything possible information from either the game or "legal" mods to "help" you.
Third: If in the future we will have difficulty level, it wouldn't be that bad idea to add markers like that in lower difficulty levels.