I think you've done an amazing job Dan....I'm convinced and I sincerely hope and reckon your grandfather would be proud of your stirling efforts.
My respects go to you and your grandfather
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Ground penetrating radar is a common feature in most modern police forces these days.
It is especially helpful in finding buried objects and or bodies at suspected scenes of crimes.
I have seen it in use on many occasions and can assure you it is a lot more efficient than fingertip searching or indiscriminate digging.
A few examples below:
http://news.bbc.co.uk/1/hi/uk/7103836.stm
http://www.global-gpr.com/services/find-evidence.html
http://www.truecrimereport.com/2008/...adar_to_be.php