PilotEdge Forums

hi flying to denver via dag, () LAS, DVC wollf crede powdr , wolllf crede and powder and gps points so without gps , i have no idiea where to go.....

my question is, if all the rest of the route its in airways vor etc then suddenly changes to gps waypoints without any notice, so my flight suddendly changed relying on gps,,,i had no ther way to double check mea etc,,,,,i was flying just relying in 737 fms

i took the route from flightaware so i just copy then into the fms, but when flying i try to read the star chart in skyvector i had no way to double check any minimun altitudes for esxample,,,

my question is, how do you check those minims altitudes if you just have a blue dot in the middle of a a chart foe example wollf....

is this safe?

luis

If you are unable, or don't have the equipment to file L/Q/G, etc, don't file it. If you are using VOR's file /A and use the appropriate dep/arr.

yes i had that equipment but i really prefer to back it up with vor etc....

I'm not 100% sure of the question, but if the question is "how do I determine the minimum safe altitude for an off airway route?" here is the answer.

So we will say you are half way between wolff and crede. This puts you near the LXV airport (highest airport in the country), but we will use that point for our reference point.

If you look at a low enroute chart you'll notice that the lines of latitude and longitude make boxes (called quadrangles). In each of these boxes you will find an altitude (coded as 2-3 very large numbers). In this case you'll see a 168 just NE of the airport. This altitude is called the OROCA (or MORA for you jepp users out there). This stands for "Off Route Obstruction Clearance Altitude" or the minimum altitude you could be at in order to be 2000' AGL at all points in the quadrangle.

So if you are above 16800 feet you would be good to go. Obviously you would check each quadrangle along your route and find the highest one.

For VFR pilots out there this is similar (but not the same) to the MEF you would find on a VFR sectional.

Hope this helps.

yes peter that what was i oloking for...the route changed form radials intersections etc, to sole blue (gps) dots without reference or coordenates etc....so i got lost, althought i followed the the fms route (wich i presumed would keep me off crashing) i was lookinf for more orientation of where i really was.

luis