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#1
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MOCA and MEA over water???
V139 goes from southern NJ to eastern Long Island, cutting off the corner
of the coastline at New York, heading out about 40 miles over the ocean. I just happened to notice that it's got MOCA's defined in addition to the MEA's. The segment between MANTA and PLUME, for example, has a MOCA of 2000. This is 25 miles from the nearest bit of terrain higher than a wavetop. Anybody have any idea why there's a MOCA defined? There's some other strangeness with over-water airways in the area too. PREPI is a waypoint 50 miles offshore (I assume it ties into the oceanic route system). It's the intersection of V276 (RBV R122) and V312 (CYN R100). What's strange is the MEA's along those airways. V276 has an MEA of 1900 near RBV, then goes up to 3000 at D15, and 6000 at D31. This is all perfectly reasonable, as it follows the floor of RBV's service volume up with increasing distance from the station. What I don't understand is why at D47, the MEA drops back down to 3000 (along with another 2000 MOCA). How can reception get better lower down as you get further from the VOR? I'm sure this is all rather academic, since I don't imagine much flying is done at those low altitudes that far out over the water. |
#2
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On Sun, 15 May 2005 11:52:57 -0400, Roy Smith wrote:
V139 goes from southern NJ to eastern Long Island, cutting off the corner of the coastline at New York, heading out about 40 miles over the ocean. I just happened to notice that it's got MOCA's defined in addition to the MEA's. The segment between MANTA and PLUME, for example, has a MOCA of 2000. This is 25 miles from the nearest bit of terrain higher than a wavetop. Anybody have any idea why there's a MOCA defined? Tall ships or shipping lanes come to mind for me. Allen |
#3
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Tall ships or shipping lanes come to mind for me.
That's a =very= tall ship! Jose -- Money: what you need when you run out of brains. for Email, make the obvious change in the address. |
#4
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I guess for MEA, if you fly lower, you might not get navigational
coverage or radio recacption with the center... It might be for other things than Terrain... On Sun, 15 May 2005 11:52:57 -0400, Roy Smith wrote: V139 goes from southern NJ to eastern Long Island, cutting off the corner of the coastline at New York, heading out about 40 miles over the ocean. I just happened to notice that it's got MOCA's defined in addition to the MEA's. The segment between MANTA and PLUME, for example, has a MOCA of 2000. This is 25 miles from the nearest bit of terrain higher than a wavetop. Anybody have any idea why there's a MOCA defined? There's some other strangeness with over-water airways in the area too. PREPI is a waypoint 50 miles offshore (I assume it ties into the oceanic route system). It's the intersection of V276 (RBV R122) and V312 (CYN R100). What's strange is the MEA's along those airways. V276 has an MEA of 1900 near RBV, then goes up to 3000 at D15, and 6000 at D31. This is all perfectly reasonable, as it follows the floor of RBV's service volume up with increasing distance from the station. What I don't understand is why at D47, the MEA drops back down to 3000 (along with another 2000 MOCA). How can reception get better lower down as you get further from the VOR? I'm sure this is all rather academic, since I don't imagine much flying is done at those low altitudes that far out over the water. |
#5
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Farther away from land may mean less interference from other VOR stations.
Consequently that segment flight checked out to a lower usable altitude? "Roy Smith" wrote in message ... V139 goes from southern NJ to eastern Long Island, cutting off the corner of the coastline at New York, heading out about 40 miles over the ocean. I just happened to notice that it's got MOCA's defined in addition to the MEA's. The segment between MANTA and PLUME, for example, has a MOCA of 2000. This is 25 miles from the nearest bit of terrain higher than a wavetop. Anybody have any idea why there's a MOCA defined? There's some other strangeness with over-water airways in the area too. PREPI is a waypoint 50 miles offshore (I assume it ties into the oceanic route system). It's the intersection of V276 (RBV R122) and V312 (CYN R100). What's strange is the MEA's along those airways. V276 has an MEA of 1900 near RBV, then goes up to 3000 at D15, and 6000 at D31. This is all perfectly reasonable, as it follows the floor of RBV's service volume up with increasing distance from the station. What I don't understand is why at D47, the MEA drops back down to 3000 (along with another 2000 MOCA). How can reception get better lower down as you get further from the VOR? I'm sure this is all rather academic, since I don't imagine much flying is done at those low altitudes that far out over the water. |
#6
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Roy Smith wrote:
V139 goes from southern NJ to eastern Long Island, cutting off the corner of the coastline at New York, heading out about 40 miles over the ocean. I just happened to notice that it's got MOCA's defined in addition to the MEA's. The segment between MANTA and PLUME, for example, has a MOCA of 2000. This is 25 miles from the nearest bit of terrain higher than a wavetop. Anybody have any idea why there's a MOCA defined? To define an altitude that ensures navaid reception between those two fixes? Hilton |
#7
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In a previous article, "Hilton" said:
Roy Smith wrote: 2000. This is 25 miles from the nearest bit of terrain higher than a wavetop. Anybody have any idea why there's a MOCA defined? To define an altitude that ensures navaid reception between those two fixes? MOCAs don't ensure navaid reception. -- Paul Tomblin http://xcski.com/blogs/pt/ "If you would like a transcript of this program, sit next to your radio with a pencil and paper and write really fast." - The WRVO Playhouse. |
#8
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Paul Tomblin wrote:
Hilton wrote: Roy Smith wrote: 2000. This is 25 miles from the nearest bit of terrain higher than a wavetop. Anybody have any idea why there's a MOCA defined? To define an altitude that ensures navaid reception between those two fixes? MOCAs don't ensure navaid reception. It does within 22 miles of a VOR, and since I don't have the charts in front of me (I'm on the West Coast) I was just making a suggestion - I don't know how far the relavent VORs are - that's why I phrased my answer as a question. Hilton |
#9
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"Hilton" wrote in message nk.net... This is 25 miles from the nearest bit of terrain higher than a wavetop. Anybody have any idea why there's a MOCA defined? To define an altitude that ensures navaid reception between those two fixes? MOCAs don't ensure navaid reception. It does within 22 miles of a VOR, and since I don't have the charts in front of me (I'm on the West Coast) I was just making a suggestion - I don't know how far the relavent VORs are - that's why I phrased my answer as a question. Well, if it's "25 miles from the nearest bit of terrain higher than a wavetop", it must be more than 22 miles from a VOR. VORs tend to be built on land. |
#10
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yupyupxav wrote:
I guess for MEA, if you fly lower, you might not get navigational coverage or radio recacption with the center... It might be for other things than Terrain... Wouldn't it be called out as a MRA rather than an MEA ? Antonio |
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