"They've now got proper paid advisers linked into Met Office data on weather patterns and tidal flows.
"If there's a weather window of a few hours, they'll know that. They've become much more sophisticated."
Claims by Prime Minister Rishi Sunak that his Government’s Stop the Boats policies had led to a significant reduction in the number of migrants crossing the Channel are "not supported by the fact on the ground," The source claimed.
He said the reduction in small boats had been driven in part by poor weather, and also by the smugglers themselves.
"By not pushing off as many boats, that creates more of a demand for places on the boats, and pushes up the price."
Regional politician Philippe Emery is adamant the migrant crisis is worse now than it's ever been
You only need to take a trip to the railway station in Calais, to see evidence of the continued arrival of new migrants into this area of northern France.
Police patrol the platforms, but are seemingly powerless to stop the arrivals.
GB News spoke to a group of young Afghans.
They had just arrived off a train from Belgium and said they planned to camp around Calais, as they wait for a small boat to take them to the UK.
Iraqi Kurds are still the predominant group in control of people smuggling in northern France.
An Eritrean gang is currently attempting to "muscle in" on some of that business, but for now; the Kurds remain firmly in charge of the lucrative trade in human cargo.
But the ultimate control is held by Kurdish gangs based in the UK, using go-betweens in multiple countries.
Migrants are continuing to arrive in northern France in ever greater numbers
Our source told us that the gangs had now adopted the same methodology used by organised crime groups in their drug smuggling operations.
Along drug routes, cartels will tip off law enforcement about a drug mule on a particular smuggling route, so that other drug mules on the same route can get through undetected.
"They'll send 10 boats out, but leak the location for one or two launches.
"The French police seize them and everyone's happy.
But the new arrivals continue to swell the makeshift campsites around Calais and Dunkirk, until the next set of police raids in this seemingly never-ending cycle of UK-bound migrants flowing through this area of northern France.