Peter wrote:
Mark Hansen wrote


If you're flying a GPS approach at your primary airport, the alternate
airport must have a non-GPS IAP. If the only non-GPS IAP requires DME,
then you need to have DME operational in the aircraft.


Thank you for saving me looking this up However, I get the
impression that Americans worry about this detail about as much as
Europeans worry about carrying an ADF when doing NDB approaches

If your GPS is WAAS capable then the requirement goes away in the US.