This paper reflects nearly three years experience of flying with Omega and suggests that in an Omega with doppler fit the necessity for the continuous compass feed can be turned to advantage by using Omega to measure and display the accuracy of the feed, which can then be applied as a system tracking correction to the doppler. The equipment we have been evaluating is a prototype Marconi Elliott AD 1800 comprising a receiver and computer in a 1 ATR black box in the avionics bay, a control display unit on the navigator's desk and an aerial input from the ADF 2 sense aerial, via a pre-amplifier and splitter that allows Omega continual use of the aerial; the ADF 2 shared access to it as required. In three years we have effectively had one hardware failure per year. These were a timing card fault, a 10 V power supply failure and a sticking ‘INSERT’ button. All these faults were detectable pre-flight; we have had no inflight equipment failures.