Over the last few years Google Map have made many improvement and changes both on Desktop and Android. It is very frustrating when we took pain staking years to create a map for everyone and suddenly everything started to shift.
On the Android Devices when we upgraded to the newer Google Map version 7, everything was lost. Could not download Offline Maps from our current location nor view Maps that we have created or bookmark.
At this current Google Map development stage Google Map Version 6 is still the best to use if there is no 3G or WiFi Network.
Here is a guide how you can have the earlier Google Map version back on the Android (No Root is required). This is not a permanent option however if needed you can still upgrade back to the latest version through Google Play Store.