We went with every intention of filming the family on the yachts but I got side tracked with everything else going on around on the river.
I was amazed how well the Mavic kept up with the speed boats and even had to slow down as I kept overtaking them and loosing the shot.
Drone users in Essex this is a great location as loads going on but close to Bradwell nuclear power station which is still a restricted area so need to be aware of that.