Navigational aids
1997 paper, on German systems (pdf), dealing with:
Aircraft Doppler-Navigation (DVL 1935/36)
X-Beams over Britain (1940)
Y-Beams over Britian (1941)
Knickebein (Croocked leg)
Y-Kampf system (for guiding "night fighters" >1943)
Elektra-Sonne (Consol) (Kramar and Goldmann)
Hermes (Hermine), British called it: Talking Beacon
Consider also: Archive displays on FuG28a Knickebein; (Y-beams over Britain, notice paticularly pp. 12-17) & Exhibits 1999002K
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