Question: One thing I haven't ever been able to figure out is this: how does SAMCRO know exactly where Cameron is headed after he kidnapped Abel? They had no direct clues, and even after watching the series a second time, it still doesn't quite make sense to me.
Answer: They didn't know he was headed to Belfast until Maureen Ashby calls Gemma and tells her that Abel is in Belfast. Cameron is her cousin and he even brings Abel to her apartment.
Chosen answer: They knew he owned the boat at the docks as that was how he brought the guns into the country. They assumed he would head there when he was needing to flee with Abel.
The_Iceman