1. First acquire ivtools and vhclmaps executables, by downloading binaries or building from source.
2. Add the following Mime Types to the appropriate file for your browser:
application/vpf-idraw; vpfs
application/dlg-idraw; dlgs
Mime Types file for common browsers:
3. Add the following helper app command lines to your ~/.mailcap file:
application/vpf-idraw; vpfviewer %s>& /dev/null
application/dlg-idraw; dlgviewer %s>& /dev/null
See here for information on setting up your browser for ivtools drawing editors.
4. Now restart your browser, and follow the instructions on one of the map viewer pages on how to download data and test the browser launching. If it doesn't work go back to step 2 and make sure you added the Mime Types to the appropriate file for your browser.