All hidden collectible locations — map guide

I've been hunting every hidden collectible in Free City's open world. Here's what I've found so far: District 1 (Downtown): 15 collectibles - 5 on rooftops (use parkour) - 4 in alleyways behind buildings - 3 in the underground parking garage - 3 inside accessible shops District 2 (Harbor): 12 collectibles - 4 on shipping containers (stack to climb) - 3 underwater near the docks - 5 inside warehouse buildings Each collectible gives credits and XP. 100% completion gives an exclusive vehicle skin. Will update as I find more!