Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.

Weekly Notices are dated for the（）appropriate to the week they are issued on the UKHO website.

On the approach of a warm front the barometric pressure usually（）.

The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）

The broken magenta line which runs parallel to the shorebetween Roanoke Point and Mattituck Inlet marks a（）.

Vessels should not anchor or trawl in the vicinity of pipelines and are（）in the pipeline area shown on the chart.

Which would influence a magnetic compass（）.

On notification by Admiralty Notice to Mariners that a new edition of one of the books，or a new supplement to one，has been published，it should be obtained（）.

The fog most commonly encountered at sea is called（）.

（）is the system for the broadcast and automatic reception of maritime safety information by means of narrow-band direct-printing telegraphy.