alphacentauri, Yes I am fully aware of the Visala system and have actually used it. I believe it was whilst being run through the various screen displays on that actual type that the BoM guy spoke about passing on the information.
I have been to other smaller sites where a system that you would buy off the shelf and meets no approvals from BoM or anyone else for that matter was being used.
Interestingly looks like the Bureau is also going to get back into supplying and installing the systems on a commercial basis.