Fast-travel to the Lazy Shore Marina (if you have already liberated it) then head to the marked location. Use the ziplines to move from platform to platform. Remember to stay cool and don't act aggressively to stay undercover. Climb the watchtower in the other side and use your camera to observe the meeting on the bridge far ahead. Take a picture while it's taking place.
Next, quickly zip to the nearby tunnel and grab an RPG if you're not carrying one. Now, aim for the 4x4 and destroy it using the RPG before the time runs out. This will make the entire camp hostile. Jump to the river if you're in a bad place then make your way back to get the role sheet. Clear the remaining enemies on the bridge and loot the body to get the sheet. Jump to the river and deploy your wingsuit to reach the getaway vehicle. Mission complete.
On mission deep throat, my camera will not appear to photograph meeting at bridge. Any suggestions?