Photo of the Day: World Trade Center Spire Adrift at Sea
Part of the World Trade Center’s spire on its way to Lower Manhattan. (Courtesy Port Authority of NY & NJ)
The spire that will one day reach a point 1,776 feet above Lower Manhattan on the ever-progressing World Trade Center is en route to New York via a barge from Valleyfield, Quebec, Canada. The Port Authority of New York & New Jersey put out a statement that the giant antenna embarked on its 1,500-nautical-mile journey on November 16 and is expected to arrive at Port Newark any day now, but a tracking website doesn’t appear to be working. Smaller pieces will be trucked in over the next month. Each segment of the spire weighs from five to 67 tons. Once the spire is on site, construction is expected to take about three months to complete.
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It’s not that the tracking website isn’t working. The barge is probably out of range of a land base
from marinetraffic.com
Why cannot I see my vessel?
The MarineTraffic system does not cover all the seas of the world, but only specific coastal areas where a land-based AIS receiver is installed. Vessels appearing on the live map are equipped with an operational AIS transponder and they sail within the reception range of an AIS receiver installed on the land. Possible reasons for a vessel’s position not picked up and displayed on the live map are:
- The vessel is not equipped with an AIS transponder or the transponder is not operational or the transponder is not properly working
- The vessel sails in an area where no nearby AIS receiving station exists/> – Th- The transmission power of the vessel’s AIS transponder is not enough in order for a land-based station to receive the signals. This depends on the type of the transponder, the type and the height of the antenna and the quality of the cabling
- Especially for vessels equipped with a Class-B AIS transponder, the transmission power of AIS signals is much lower than the power of a Class-A transponder and therefore the reception range in much more restricted
- The AIS transponder of the vessel is not configured to transmit the correct information (e.g. MMSI number, ship’s name etc.)
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Thank you colleagues architects for this honour!
This unauthorized publication of my flickr album might soon get in the news about copyrights infringements.