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Essential maintenance

HES is currently undertaking essential maintenance on our web services. This will limit access to services in the following ways:

- Subscription access for HES online services will be unavailable (Scran, NCAP)

 - Image purchasing options will be limited (Canmore, Britain from Above, Scran, NCAP)

 - Any enhanced services which require a log in will be unavailable (My Canmore, Britain from Above contributions, Scran contribute)

 General access to these services will all continue. Enquiries will still be able to be submitted.

 We anticipate services to be restored from Monday 1st February 2021.


Bower, Composite Signals Organisation (C.s.o.s.) , Bowermadden, Rdf Out-station No. 2 Site

Radio Mast(S) (20th Century), Radio Station (20th Century)

Site Name Bower, Composite Signals Organisation (C.s.o.s.) , Bowermadden, Rdf Out-station No. 2 Site

Classification Radio Mast(S) (20th Century), Radio Station (20th Century)

Alternative Name(s) Admiralty Rdf Station; Gchq Signals Monitoring Station

Canmore ID 268068

Site Number ND26SW 61

NGR ND 24370 64076

Datum OSGB36 - NGR


Ordnance Survey licence number 100057073. All rights reserved.
Canmore Disclaimer. © Copyright and database right 2021.

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Administrative Areas

  • Council Highland
  • Parish Bower
  • Former Region Highland
  • Former District Caithness
  • Former County Caithness

Archaeology Notes

ND26SW 61.00 24370 64714

For No.1 site, see ND26SE 28.

ND26SW 61.01 ND 23651 62960 Building (administration No.3 site)

ND26SW 61.02 ND 23555 62117 Radio mast (No.4 site)

ND26SW 61.03 ND 24779 61576 Radio masts (No.5 site)

Bowermadden No.2 site RDF out-station for the former Admiralty Radio station and C.S.O.S GCHQ signals monitoring station. This site incorporated a masts within a circular enclosure. The running of this station was taken over by GCHQ (Cheltenham) in 1967 and The station closed in 1978 has has been de-requisitioned and the site sold back to the landowner.

The mast area is visible on RAF vertical air photographs (106G/Scot/UK 75, 4409-4410, flown 9 May 1946).

Information from Defence of Britain Project form (Mr A Gutteridge), 1986 and 1999 and RCAHMS (DE), November 2004


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