Originally Posted by
212man
Doesn't multilateration address this? Innocent question as never operated with it.
WAM only works above 1500ft, so not down to deck height. And it's not the most reliable of systems either. If/when it drops out, the 'outer sector' (ie from 80nm from the ADN to the Median line) reverts to Aberdeen Information with a Basic Service.
Even with WAM, you still don't get any effective radar or traffic service below 1500ft.