I just found some interesting references to dowsing in the 2016 book Lucifer Rising - British Intelligence and the Occult in the Second World War
by Nicholas Booth.
(p 59) Booth asserts that Hitler's deputy, Rudolf Hess,
... slept under magnets to draw out any harmful substances in close proximity, and routinely tested bedrooms with divining rods to ensure no underground waters could cast any lingering malevolence while he slept.
He doesn't provide any reference for this unfortunately. Still, it's more evidence of dowsing being used by the Third Reich.
(p 218) - in a section discussing the appointment of Lt Col Kenneth Strong as head of MI14 (the department of Military Intelligence responsible for interpreting the German military's strategic intentions) in the spring of 1940, Booth writes:
Nothing was beyond the remit of 'The German Section' and that came to include the consultation of a water diviner who Strong christened 'Smoky Joe'.
I'm wondering who this could be? Assuming that 'Joe' is not a code name, the most likely candidate is probably Joseph C Maby, an early BSD member. He co-authored a book called The Physics of the Divining Rod
with Beford Franklin, which was published in 1939 by G Bell and Sons (unfortunately, the main supply of the book in Southampton was destroyed during a bombing raid during the war).
The book's publication led to Maby being asked to give a lecture to the Royal Society of Arts on 13 March 1940, which was chaired by BSD founder Col A H Bell. Conceivably, Strong could have attended this meeting. This fits well with the general time frame.
(This information comes from a transcript of Col Bell's address, Early Days of the BSD
, at BSD Congress on December 25, 1954.)
(p 336) - In discussing statements by German astrologer Wilhelm Wulff, made after his release from Fuhlsbuttel Prison in 1943, there is mention of Nazi officials employing dowsers to do map dowsing to locate Allied submarines.
The Germans often did this over a map (which was how the Munich physician predicted the presence of Jews). The astrologer's own expertise extended to a particular Indian pendulum known as the Tattua. 'Day in, day out, the pendulum practitioners squatted with their arms stretched out over nautical charts,' Wulff would write.
I'm not sure who 'the Munich physician' refers to. Or what a 'tattua' pendulum looks like.