[time-nuts] Earth rotation angle parameters via GPS?

[Bruce Griffiths]

The GPS interface control document IS-GPS-200D defines message type 32 
on page 145 (Figure 30-5) and pages 175-178.
The message contains the parameters necessary to calculate UT1 (Earth 
rotation angle) when UTC is known.
Does anyone know of a readily available GPS receiver that makes these 
parameters accessible to the user?

Bruce