Determining Precise Lat/Long of Waypoints

    I'm planning a new (fictional) airport, so there are currently no aspects of it that are in MSFS or Navigraph data. I have figured out how to do the buildings and runways and lights and taxiways etc, but now I'm trying ot work out how i would set up the SIDs and STARS for my airport. I know how to create them as long as I have precise Lat/Lon points to enter. I think i'm THIS CLOSE to knowing what i need ot make my airport fully functional.


    So if i know the lat/long values of both ends of the runway, how do i determine the precise lat/long of (for example) 3.3nm and 7.9nm from the ends of the runway for the waypoints in the SID and STAR? (I'm assuming this is like most questions I ask on forums, it's obvious and staring me in the face only I'm too dumbass to see it. I promise to slap my forehead when i know how!)


    Cheers

    Mike Kear

    Windsor, NSW, Australia

    OK,

    In Google Maps:

    1. go to your measuring start point.
    2. Right click
    3. Select (down the bottom) "Measure Distance"
    4. move cursor to or beyond required point
    5. Right Click
    6. Select "Distance to here"
    7. You'll see a line with distance measurements on it

    You can delete the line using the same menu.Gee, I love these questions that make me put my thinking cap on, and work out something that I've been wondering about for some time

    😉

    JohnG

    From Oz, Flight Simmer since FS1 - seriously since FS95

    Contributed to, and managed a site called ProjectAI for a time

    Thank you John. Here's another part to the question. I had figured from my years using Adobe projects it would be something like you described. But how do you think I'd find the precise spot, on a direct line from the runway?


    On something like adobe illustrator, if this was just a drawing, I'd put a construction line along the runway and extend it out the distance to the IAF and then use the method you outlined to find teh spot i want somewhere along that construction line. But i couldn't find a way to do that in Google Earth. Is there one and i missed it do you know?


    Cheers

    Mike Kear

    Windsor, NSW, Australia

    OH!OH!OH!OH!OH! I think I've got what you were pointing to John G. Thank you.


    For example let's say I have a runway, let's say it's runway 11/29. It's 4500 feet long. I need to create a waypoint called HOZEA, which will be 7.9nm from the start of runway 11, on a line 291deg/111deg. So i go to the far end of the runway, the RWY29 end, and place the end of the ruler there, then stretch it all the way along the runway, past the end of the runway, and at least 7.9nm further on, such that it lies over the middle line of the runway. THEN i have the point i'm looking for. And a right click on google maps will give me the precise location of point HOZEA so I can enter the details on the xml file and i have the wayoint details i need!


    I reckon that will work. I'm going ot try it out. I'm sorry i''m chatting as though I just thought of it but I realise that's what you were telling me in your answer already but i was just too dense to see it then.


    Thanks John G.

    Cheers

    Mike Kear

    Windsor, NSW, Australia


    p.s. Didn't I say this was going to be one of those 'slap the forehead' moments? And so it was!!