Mark commented on GPS, don't underestimate its accuracy. When I was flying the 767 I compared the GPS speeds with our (extremely accurate) IRS readouts they were spot on and now diffential GPS is available we can expect some very accurate position recording too. We will be reviewing the JetCat GPS in detail in RCJI just as soon as Bob gets my unit here. Flight tests will be in a160 powered F15
BRG, David Gladwin