When you come across this mission, take the time to find the desired items from the contact....so worth the payout.
where exactly is the starting point for this mission? i have been free roaming for a few days now and i have seen no such thing. Will it be a question mark or a blue dot or what?
You have to buy the Sonar Collections Dock with Michael, located on the North western side of the map also called Chiliad Mountain State Wilderness along the beach/coast area. You will see it for sale.