There were three types of Chelmer & Blackwater plaque available.
The Blue Plaques
These plaques are "Souvenir" plaques, available to buy without any qualification needed.
The Red Plaques
To qualify for this plaque your boat must have been at the 1997 National Trailboat Rally at Springfield Basin.
The Black Plaques
This is a limited edition numbered plaque. (number on reverse) In order to qualify for this plaque you must navigate the whole length of the navigation. A photograph of your boat in Springfield Basin, and another of your boat in Heybridge Basin will be accepted as proof of your achievement.
All three types of plaque are now sold out, but the trust hopes to have more plaques available soon.