I believe they also run a number of coast watcher stations
One at Suez port and along the the shore of the red sea.
and at the Strait of Hormuz.
This would give them the knowledge of the ships and there speeds when they transit this area.
These may be Somalis or people that report just for a piece of the action.(reward)
I also believe they also monitor the marine radio net once they have the ships names to plot course and speed and next port.
I believe if the shipping companies would use encrypted data systems instead of voice radio to send there daily position reports and a code name for
the ship and a encrypted latitude & longitude that the pirates would have a harder time tracking them.
And the pirates would have a hard time using GPS to be on the ships course to meet them if they did not know the course and speed because it was
encrypted.
Its easy to find the information on a ship including its top speed just by looking up the ship on the internet.
en.wikipedia.org...
In at least one case the pirates have remained in contact with their London informants from the hijacked ship, according to one targeted
shipping company. The pirates' information network extends to Yemen, Dubai and the Suez canal. The intelligence report is understood to have been
issued to European navies. "The information that merchant ships sailing through the area volunteer to various international organisations is ending
up in the pirates' hands," Cadena SER reported the report as saying. This enables the more organised pirate groups to study their targets in
advance, even spending several days training teams for specific hijacks. Senior pirates then join the vessel once it has been sailed close to Somalia.
Captains of attacked ships have found that pirates know everything from the layout of the vessel to its ports of call. Vessels targeted as a result of
this kind of intelligence included the Greek cargo ship Titan, the Turkish merchant ship Karagol and the Spanish trawler Felipe Ruano. In each case,
says the document, the pirates had full knowledge of the cargo, nationality and course of the vessel. The national flag of a ship is also taken into
account when choosing a target, with British vessels being increasingly avoided, according to the report. It was not clear whether this was because
pirates did not want to draw the attention of British police to their information sources in London. European countries have set up Operation Atalanta
to co-ordinate their military efforts in the area.