The other day I encountered a player who was able to take the reapers mark chests from the FOTD and hide the icon from the map while he put it on a rowboat. His remark was the mark gets hidden from the map after floating for 5 minutes and then sitting on the SEA floor for 5 minutes.
There is no way he had 10 minutes of time loading the chests up lol.
Question is , is this a glitch or mechanics in game. Seemed a bit fishy to me ...
