Question: How many ships currently fly the Greek flag?
About the article "Greece", section "Maritime industry".

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Merchant ships often fly a flag identifying which company owns the vessel.
This was formerly flown from the mainmast but is now usually flown from the jackstaff. 
The eleven stripes symbolize the signatories of the Liberian Declaration of Independence, red and white symbolizing courage and moral excellence.
The white star represents the freedom the ex-slaves were given, above the blue square representing the African mainland.
The flag is seen on many ships around the world as Liberia offers registration under its flag.
Shipping companies do this to avoid taxes and restrictions that other countries enforce.
As the second most popular flag of convenience (after Panama), it is estimated that 1700 foreign-owned ships fly the Liberian flag.
This brings in much of the country's revenue. 
The flag of the United Arab Emirates () was adopted on December 2, 1971.
It contains the Pan-Arab colors red, green, white and black, which symbolize Arabian unity.
Merchant ships may fly the alternative civil ensign, a red flag with the national flag in the canton. 
On 16 January 1899, commissioned ships of the United States Coast and Geodetic Survey were authorized to fly their own flag to distinguish them from ships of the United States Navy, with which they shared a common ensign.
Although they continued to fly the same ensign as U.S. Navy ships, ships of the Survey flew the Coast and Geodetic Survey flag as a "distinguishing mark" until the newly created National Oceanic and Atmospheric Administration (NOAA) took over control of the Surveys ships in 1970.
Since then, commissioned ships of NOAA, which also fly the same national ensign as U.S. Navy ships, have flown the flag of the National Oceanic and Atmospheric Administration as a distinguishing mark.
Similarly, all ships of the United States Lighthouse Service flew the US Lighthouse Service flag until the service merged into the United States Coast Guard on 1 July 1939. 
The NOAA flag is a modification of the flag of one of its predecessor organizations, the United States Coast and Geodetic Survey.
The Coast and Geodetic Surveys flag, authorized in 1899 and in use until 1970, was blue, with a white circle centered in it and a red triangle centered within the circle.
It symbolized the use of triangulation in surveying, and was flown by ships of the Survey.
When NOAA was established in 1970 and the Coast and Geodetic Survey's assets became a part of NOAA, NOAA based its own flag on that of the Coast and Geodetic Survey.
The NOAA flag is in essence the Coast and Geodetic Survey flag, with the NOAA logo—a circle divided by the silhouette of a seabird into an upper dark blue and a lower light blue section, but with the "NOAA" legend omitted—centered within the red triangle.
NOAA ships in commission display the NOAA flag; those with only one mast fly it immediately beneath the ship's commissioning pennant or the personal flag of a civilian official or flag officer if one is aboard the ship, while multimasted vessels fly it at the masthead of the forwardmost mast.
NOAA ships fly the same ensign as United States Navy ships but fly the NOAA flag as a distinguishing mark to differentiate themselves from Navy ships.