There are three currencies in use on Ghara.
The official currency of the Taivas Islands is the markka. It is abbreviated as mk.
1 markka corresponds to about 1 sp in the PHB.
1 Ruble = 0.1 Markka = 0.2 Lira
1 Lira = 0.5 Markka = 5 Rubles
1 Markka = 10 Rubles = 2 Lira