"We need the public to be engaged to convince governments and convince the seafood industry that they need to solve the problems of overfishing," Amos told AFP.
"If you can't see it and can't measure it, you are not going to care about it and it is not going to get solved."
The project has cost $10.3 million over the past three years to build, with six million of those dollars contributed by DiCaprio himself, Oceana vice president for US oceans Jackie Savitz told AFP.
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In order the make the data available for free, the partners negotiated a deal with the satellite company Orbcomm to use its three-day old data, which is described as "near real-time," along with historical records.
Although the delay means that any criminals won't be nabbed instantaneously, advocates say the technology will open the world's waters to public watchdogs in a way that has never been done before.
"We think it is going to have a lot of impact, first of all just the deterrent effect of vessels knowing that we could see them if they are doing something they are not supposed to be doing," Savitz said.
"You can look at an area you are interested in, zoom in and see what data we have."
For instance, users could zero in on a marine protected area and see if any boat tracks have crossed into waters where they should not have been.
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One could scan the map for any evidence that large vessels are fishing in areas that are reserved for small-scale fishermen.
Vessels can be tracked by name or by country, or by traffic inside exclusive economic zones.
The paths of ships are visible, including zig-zags paths that could indicate vessels are avoiding shore to offload their catch on to other ships undetected, or that other illegal operations or human rights abuses may be under way.
Savitz said some capacities may be beyond the ability of the average Internet user, but that experts are available via the website to help with specific questions.
Future versions of the technology may even include tagging data for marine animals, so that the paths of whales and sharks and other fish might be visible alongside the vessel activity, she said.
Currently, Global Fishing Watch does not include every vessel, only those that broadcast data from the Automatic Identification System (AIS), collected by satellite and terrestrial receivers and meant mainly as a safety mechanism to avoid collisions.
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Many of the world's largest fishing vessels are required by the International Maritime Organization to use AIS.
AIS can be turned off if the boat operator is doing something illegal, but Savitz said that such an on-off action would likely be apparent by tracing the boat's appearing and disappearing tracks.
Already, the government of Kiribati has used Global Fishing Watch data to unmask illegal fishing in the Phoenix Islands Protected Area (PIPA), declared off-limits to commercial fishing on January 1, 2015.
The owners of the vessel had to pay a $1 million fine and also made a "goodwill" donation of another $1 million grant, Oceana said.
DiCaprio is scheduled to unveil the technology at 1:30 pm (1730 GMT) Thursday, in a presentation viewable online at www.ourocean2016.org.
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