Revelation 2:8

Smyrna : a city Located on the west coast of Asia Minor, it is now called Izmir.
(38° 27´, 27° 9´)

Revelation 1:17-18

Alpha : a title of Jesus Christ

Hades : the place of departed spirits (NIV notes); the unseen world (YC)

Revelation 3:1

Sardis : the capital city of the province of Lydia in Asia Minor
(38° 28´, 28° 6´)