SOLAS VGM (Verified Gross Mass) is effective as from 1st of July 2016.
VGM is required for containers shipped by sea.
Embassy Freight PDF about SOLAS – VGM
Embassy Freight Services Europe N.V. designed a clear overview about SOLAS – VGM : PDF EMBASSY FREIGHT
Method 1 and method 2
In search of more information about method 1 and method 2 : open this PDF.
Looking for extended information SOLAS mandatory requirement