Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

Why does the mode C altitude data disagree with the Mode S altitude data shown in the AC field UF0, 4, 16 & 20 tests?

April 26, 2017AC altitude Data disagree field mode s

0

Posted

Why does the mode C altitude data disagree with the Mode S altitude data shown in the AC field UF0, 4, 16 & 20 tests?

1 Answer

0

Posted

Altitude reported in Mode S DF’s 0,4,16 & 20 may disagree with Mode C altitude reports. This is due to resolution differences. Mode S has an altitude resolution of 25ft, Mode C has an altitude resolution of 100ft. Differences are most noticeable below 300ft and discrepancies of 50ft are not uncommon.