The GPS will take you to the shed but is of little value inside.
Given the bird observation platform is made of corrugated iron, there should be endless places to hide a magnetic nano but most of the walls are now covered with information boards and it is not behind any of them, so potential hiding spots are limited if you apply a little bit of logic.
If you want a bit of exercise, you can walk to here from the parking for Seaham Swamp - or park here and walk to the Swamp and Edgeworth David Quarry. A nice little cluster of caches.
The following info is from the NPWS
The diversity of waterbirds that frequent the reserve provides an opportunity for bird
enthusiasts to observe the birds in their natural state. A bird observation tower was
completed in 2001. It was initiated by representatives of the Wetlands Centre (Australia),
NPWS, Port Stephens Council, Friends of Seaham Quarry and local residents and funded
by a Natural Heritage Trust grant. The bird observation tower provides an excellent
opportunity for viewing birds and also provides interpretative material on species that are
likely to be seen in the reserve. Information on the breeding cycle of the cattle egret is also
provided in the bird observation tower. The footprint of land on which the tower was built
was transferred from Council to the NPWS in 2003.
Since 1985 there has been research undertaken on the cattle egrets nesting and roosting
in the reserve. The research is referred to as ‘Project Egret Watch’ and is an initiative of
The Wetlands Centre Australia at Shortland. Dr Max Maddock undertakes the project with
the assistance of volunteers and pupils from Seaham Public School which has the cattle
egret as it logo.
The aim of the project is to tag the cattle egrets that are nesting within the reserve to gain a
better understanding of the biology, ecology and migration of the birds. Cattle egrets are
also tagged at the Hunter Wetlands Centre, at several other colonies in northern New South
Wales and Queensland, and at one location in Gippsland, Victoria. Other species of egret
are also tagged as one part of the project including the great egret (Ardea alba),
intermediate egret (Ardea intermedia) and little egret (Egretta garzetta).