If you just so happen to have some extra random Helix Credits lying around you can go to the Estore: Timer Saver Packs and purchase the Cockades and Chest Map. This will reveal the location of all Cockades and Chests on the map.
Do this only if you have the random Helix Credits to spare. Please do not purchase any additional Helix Credits from Ubisoft. We do not want to encourage these kinds of micro transactions in future games.