ECW file header

There is a tool by Intergraph/ERDAS for modifying ECW headers called "ECW Header Editor". If you need to apply a new insertion point you can just open the ECW file, enter the new coordinates and save the changes back to the file.

Command line version is available as well. The tool is part of a package called "Apollo Essentials".

Current download URL : 

http://download.intergraph.com/downloads/erdas-apollo-essentials---image-web-server-2011-utilities-version-11.0.4