A lightvessel or lightship  is a ship which acts as  a lighthouse in waters that are too deep or otherwise unsuitable for lighthouse construction.
A crucial element of a lightvessel design is the mounting of a light on a sufficiently tall mast.
A large number of these ships were  in service in Northern Europe (Germany, UK,  Norway, Sweden, France, etc..) and in North America, mainly in the USA.
Lightships were named after the sandbars they covered, particularly in Europe (Dyck, Sandettié, Ruytingen, Bassurelle ou Snouw).
With the arrival of  modern navigation tools and automatic beacons, very few of these units are still operating.

The Channel which is now under modeling process was located northwest of Guernsey.

Location
English Channel
Position :
49° 54"42" N - 2°53'67" W
Built in
1958
Designer
Philip & Son - Dartmouth
Lenght
148 feet
Width
26 feet
Elevation (DZ)
23 feet
Automated in
1989
Light range
25 nautical miles
Optics
Revolving mirrors
Light signal
15 seconds interval white flash
Fog signal
One blast every 20 seconds
Landing pad
Yes
Visitors allowed
No
Inhabited
No

Never seen before in FSX©* !  A ship landing pad is moving in accordance with pitch and roll movements induced by swell !. The vessel is rolling up to an 8° amplitude and  pitching up to 4° and 5°.

Under bad weather conditions, concentration will be needed to complete a full  approach and landing. Once landed, your helicopter will tend to slide on the pad according to the ship moves. Even if virtual, your situation will be close to reality.

* Not available for FS2004

Click image to enlarge