Major & Mrs Holt's Battle Map of the Gallipoli Battlefield
Shows;
Modern Roads
Grid Reference system
Location index
Battle lines 1915
Anzac , Helles and Suvla included
Bunkers Forts Guns Trenches position
1915 Place Names
Ross Bastiaan Plaques
Ship Wrecks
Memorials
Museums
Cemeteries
Tourist Info

If travelling to the Australian Battlefields see this book, Anzacs on the Western Front which is the best available.