From the PlanePlotter web page
http://www.coaa.co.uk/planeplotter.htm
Multilateration in PlanePlotter
Multilateration to locate Mode-S aircraft that are not transmitting ADS-B position reports, is a premium service within PlanePlotter. Only "Master Users" of PlanePlotter can initiate multilateration requests.
SBS1/SBS1e users who are regular raw data providers are automatically Master Users. If you are an SBS1/SBS1e user and if you have set up your system to provide raw data to the multilateration scheme and your system has been validated and you make it generally available for other users' benefit, then in return for your contributing raw data, you are automatically entitled to Master User status and there is no additional fee for using this feature. Note that providing raw data is not the same as the routine Internet sharing of aircraft data between users and very occasional or intermittent provision of raw data does not qualify. Only regular raw data providers have automatic Master User status.
If you are a PlanePlotter licence holder but are not an SBS1/SBS1e user, or if there are reasons why you cannot contribute raw data regularly, you can request temporary Master User status for an experimental period of 21 days using the link below. If you request the 21 day trial, you are not committed to paying any fee unless you want to continue to use it after the end of 21 days. After that, you may choose to pay a small fee of Euro 12.00 (plus VAT in EU countries) to continue as a Master User. To request your 21 day free trial, please follow the link below.
Request 21 day trial of Multilateration.
http://www.coaa.co.uk/mlat_request.php
Just be aware that MLAT hasn't been set up in Sydney or Melbourne yet, but there is a race on be the first in Australia. It may happen this weekend - fingers crossed.
