“+”(properly called a Pattee cross but often called a Maltese cross) means the ship was constructed under survey by Lloyd's Register surveyors; "100" means the ship is suitable for seagoing service. "A" means the ship was constructed or accepted into LR class and is maintained in good and efficient condition. "1"means she has good and efficient anchoring and mooring equipment.
The master of a UK ship must ensure that, when the ship enters a VTS area in the territorial waters of an EEA State (i. e. an EU Member State, Norway or Iceland), the ship must comply with the rules of the VTS if they are in accordance with IMO Guidelines. The master of a non-UK ship must ensure that, when the ship enters a VTS area in UK territorial waters, the ship must comply with the published or promulgated VTS rules.