Trying to think of the plot - just there at the end with the phrase "Hodie mecum eris in Paradiso" refers to the seven last words of Christ. Based on the map to it looks like it follows around the horn of southern Africa and passed Madagascar.
It also showed "Every betrayed us all" - wonder if it refers to Henry Every who was a 17th Century pirate that was considered the most successful pirate of all time. He eventually betrayed his crew and lived off the cost of africa where he and his treasure was never found again. He was suspected to have lived in a Colony at Île Sainte-Marie/Nosy Boraha which was a well known pirate haven in that area. More specifically the rumored colony of Libertatia.
So a pirate themed Uncharted by chance with Drake hunting the treasure of the most successful pirate ever in the south indian?