> Recently I added support for adjusting the DME readout based on an
> optional per transmitter bias that is part of Robin's nav data.  For ILS
> approaches the DME transmitter could be at the opposite end of the
> runway, but transmitting a bias or "constant value" to subtract off the
> real value so it reads 0.00 at the touch down point.

I've never seen a negative DME, and I don't think it's possible to see one.

As far as I know (I'll confirm today at work) there is no requirement that the 
DME read zero at touchdown.

David Culp

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