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Garmin 430 rquestion- does the approach always have to be activated via "activate approach"?
Sam,
When you select a LOC or ILS, you instead receive an advisory message cautioning you that RNAV is for monitoring only. Yes, but you can (and should, per the manual) activate them. So the question remains, what exactly does that do? In my experience, it starts both sequencing of the waypoints in the procedure and the change in CDI sensitivity. And from my experience, same goes for an RNAV approach. The 430 just continues to fly the original flightplan if you don't make it fly the approach - by activating it. -- Thomas Borchert (EDDH) |
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Garmin 430 rquestion- does the approach always have to be activatedvia "activate approach"?
Thomas Borchert wrote:
Sam, When you select a LOC or ILS, you instead receive an advisory message cautioning you that RNAV is for monitoring only. Yes, but you can (and should, per the manual) activate them. So the question remains, what exactly does that do? In my experience, it starts both sequencing of the waypoints in the procedure and the change in CDI sensitivity. And from my experience, same goes for an RNAV approach. The 430 just continues to fly the original flightplan if you don't make it fly the approach - by activating it. I agree that the manual says to activate a previously loaded approach. But, it is overkill and unnecessary. En route to terminal sensitivity occurs when passing within 30 miles of the airport reference approach, whether or not an approach is loaded., *provided* the destination airport is the final waypoing in the flight plan. Once flying an approach it will activate (approach sensitivity and approach RAIM) when reasonably on course and passing inbound 2 miles prior to the FAF. You can hit the "activate approach" option all day long once on an approach flight plan and inside the IAF, and nothing will happen until you reach 2 miles from the FAF. And, the same will happen at 2 miles from the FAF without ever pressing the "activate approach" option. Try it in the trainer on any RNAV (GPS) IAP (or overlay IAP). |
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Garmin 430 rquestion- does the approach always have to be activated via "activate approach"?
On Sat, 16 Feb 2008 14:17:02 -0800, Sam Spade
wrote: I agree that the manual says to activate a previously loaded approach. But, it is overkill and unnecessary. En route to terminal sensitivity occurs when passing within 30 miles of the airport reference approach, whether or not an approach is loaded., *provided* the destination airport is the final waypoing in the flight plan. Once flying an approach it will activate (approach sensitivity and approach RAIM) when reasonably on course and passing inbound 2 miles prior to the FAF. You can hit the "activate approach" option all day long once on an approach flight plan and inside the IAF, and nothing will happen until you reach 2 miles from the FAF. And, the same will happen at 2 miles from the FAF without ever pressing the "activate approach" option. Try it in the trainer on any RNAV (GPS) IAP (or overlay IAP). Thanks Sam. Your response agrees with my simulator observations and clears up my confusion. |
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