Forensic archeologists are working with the maps
Forensic archaeologist Professor John Hunter of Birmingham University, and Greater Manchester Police will use the maps to try to find the body of Keith Bennett.
The maps were obtained, via an intermediary, by Keith Bennett's brother, Alan, who has spent 15 years trying to find the missing body.
They appear to point to a different part of the moor to that previously identified by police.
In an emotional interview for the BBC, Keith's mother Winnie Johnson said: "Both me and my family have had 39 years of this.
"Keith would be 50 next year. I mean, he could have had a family of his own .
"You can see how innocent he was."
Police will also re-examine photographs of Hindley taken by her partner-in-crime Ian Brady.
According to Hindley, one of the pictures of her kneeling on the ground was taken directly on top of the grave of another victim, John Kilbride.
Professor Hunter said the drawings had helped confirm some of his own investigations.
"I have been out on the moors thinking about where Keith might be buried since 1994."
Torture recordings
He said they had managed to narrow down the search area by "re-washing existing information", looking at aerial photographs and using geophysical survey techniques
"We have managed to isolate an area of moorland which we think has a better than 50-50 chance of where Keith might be."
The search effort has been hampered in part by the shifting of the peat on the moor which has taken place over the last 40 years.
Myra Hindley and Ian Brady were given life sentences in 1966 for killings Lesley Ann Downey, 10, John Kilbride, 12, and Edward Evans, 17.
They tape-recorded themselves torturing their victims, whose bodies were buried on Saddleworth Moor, overlooking Manchester.
The pair admitted in the mid-1980s that they had also murdered Keith Bennett, 12, and Pauline Reade, 17.
Pauline Reade's body was found in 1986 but the body of Keith Bennett has never been found.
Hindley, who is in Highpoint prison in Suffolk, has in the past visited the moor on two occasions to assist police in their search.
The killer has made a number of legal bids for freedom, but has been told by the Home Secretary, Jack Straw, she will never be released from prison.
The new BBC2 documentary series Bodyhunt will be screened on Thursday 15 November at 2100 GMT