The photos below where taken at different low tides and show the channel from Birdham Pile to the Lock. The posts are referred to as number 1 at the outer end of the channel to 5 nearest the lock in the descriptions below. The downloadable waypoints are an attempt to define the line of the deepest water.

Birdham Pile on the left to the third channel post in the middle.
Cambermet tide height 2.0m. January 2023.
The first to third channel marker posts.
Cambermet tide height 0.8m. September 2022.
Birdham Pile on the left to the forth channel post
Cambermet tide height 2.0m. January 2023.
The third to fifth channel marker posts.
This photo was taken from the left of the previous one looking the other way.
Cambermet tide height 2.0m. January 2023.
The forth and fifth channel marker posts.
The fifth is inline with the white building.
Cambermet tide height 2.0m. January 2023.
The view from the lock to the fifth channel post.
Cambermet tide height 0.8m. September 2022.
The view from the lock to the fifth channel post.
Cambermet tide height 1.6m. April 2022.
The view from the lock to the fifth channel post.
Cambermet tide height 2.0m. January 2023.
The view along the channel from the pontoon on the right in the previous photo.
Cambermet tide height 2.0m. January 2023.