Wow. Now that's a good question. Inquiring minds want to know. I myself am in the midst of hooking up a digital altitude source to a GTX 345. What about the GTN? What can that expensive wonder device do with serial or ethernet altitude input?
Jim
Is there an advantage to hooking up pressure altitude, such as the SSD120-30A-RS232, to the GTN-650?
Pressure altitude is also required for some procedures. The ones that say "climb to XXX before turning to 123". An IFR navigator can't give guidance on when to turn without the pressure altitude connection.