In the garden and on the water

Another day of work in and around Claire's new house and garden. Rusty looks on as we pause for a cold drink of water.
At the edge of Claire's garden is a sea mark. (Extra)
The river becomes very wide here but also very shallow with low lying islands and sandbanks to navigate past. These three markers (one on the far shore) confirm you are in the channel as long as they are all lined up with your course.