All Imray charts are based on WGS 84 datum as indicated in the catalogue. Apart from some of the Imray-lolaire charts of the Caribbean Sea, all are metric.
Every chart includes details of the datum and projection on which it was based, to allow it to be used safely with satellite navigation systems.
См. также Греция, от Монемвасии до Северных Спорад (часть №1)