Cw
Thanks for your input.
The nub of the problem for me lies in the fact that for these new, expensive and now compulsory DSC radio transceivers to provide their intended functionality, the GPS must be on and interfaced at all times. This is so that if the operator has need to hit the distress button, the radio sends an automatic broadcast including GPS position. If the radio is wiping out the GPS signals, even on receive (which it is) I am left with Type Approved equipment costing many hundreds of pounds which don't do the business.