Finnish to English Other Other military, surveying, peat investigations, geology

This is word that occurs in a scientific report describing fieldwork on peat/bog/mire areas by Finnish geologists. It is an instrument used by the Finnish military at least since 1946. I think it is a some sort of “sighting compass (hand bearing compass)” but I am puzzled that the pictures I have found on the internet have 60 divisions (each is six degrees?).

My provisional translation is “military sighting compass”.

Can anyone confirm and/or explain further.

Images and further information:
http://tietokannat.mil.fi/verkkopartio2008_aselajikouluttaja...
http://www.huuto.net/kohteet/suunto-kasisuuntakeha-sa-int--l...

Thanks
Graeme