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# Lat/Lon problem at EGCC POL VOR

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HiI'm having a problem with regards to EGCC LIS1Z for 5R DmeIntc53.356944-2.262222000at0551.2AutoI can calculate the lat/lon of the point on the 55 radial, 1.2 nm from the MCT VOR accurately. (INTC)Intc53.743889-2.103333000at090188AutoDmeIntc53.743889-2.103333020000above018824AutoLooking at waypoint 3 above I calculate the lat/lon of the point on the 188 radial, 24nm from the POL VOR.(calculating from radians to deg/min gives lat of 53 44.633340 and lon of -2 6.199980 for the POL VOR, entering these into the online calculator gives me the position as show below)Question is why does the 188 from the POL VOR appear to be more to the left than the intercept line on the flightplan?Is this something to do with your navdata?Many thanksGrahamhttp://forums.avsim.net/user_files/188190.jpghttp://forums.avsim.net/user_files/188191.jpg

Graham

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After a bit more investigation I have flew the cessna 172 on radial 188 at dme from POL VOR of 24 and it more or less is correct with the white flight plan line corner.That means that the formula I am using must be incorrect yet I have coded the formula and also used several online calculators and they all point to the same result as where my aircraft is on the above picture.Whats wrong here? Any ideas?Thanks

Graham

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Hi,Wish I could edit these posts!Been looking at some older navdata files including user ones and I've noticed that you have intercept heading of 90 deg yet most other files have around 150 deg.Is this correct do you think?thanksGraham

Graham

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Hi Terry,Yes I understand what you outline above.I've sorted the problem now, well my interpretation of the problem anyhow. Instead of using LNAV at 450ft agl on takeoff I used HDG SEL, track 55deg for 1.2nm then whizz around to the right at 188deg and then LNAV again when on the outbound radial.Works fine now.Still have the problem in my first post but I suppose its not related to your data anyhow. I still cant figure out why the aircraft is not placed on the correct position (188deg radial at 24nm from POL VOR).I've solved that by reading the lat/lon values from FSBuild flight plan and copying them into my runway transition array and it works perfect now.Thanks for your help TerryBest regardsGraham

Graham

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