Baltic light ships moving to another position according to the weekly appreciation of matters of naval interest No. 61 for the week ended 14 February 1920

An item referred to the Senior Naval Officr (S.N.O.) Baltic who reported that the light ships at the points 12 and 13 on the Baltic route and mine chart left their positions on account of ice.

Source

The National Archives, Kew Gardens, England CAB-24-98-79