Mycenaean Atlas Project
The purpose of this web site is to provide accurate latitude and longitude coordinates for all the Early, Middle, and Late Helladic (Mycenaean) find sites both in Greece and in places which the Mycenaean culture touched. This site also provides some bibliographic information as well as times of occupation and the nature of the finds at the various sites. The main purpose is, however, to provide locational information.Locational Data: Accuracy
Every effort has been made to confirm the exact location of each site. For a complete description of this parameter and of the concepts of Precision and Accuracy as they apply to this web site see this.
And see AWOL's Roundup of Resources on Ancient Geography