I'm looking for a method or program where I can input two seperate lat/lon coordinates and come out with a center coordinate which lies directly between the two. I need such information for runway placement in FSSD, a lack of displaced threshold coords. for KSJC on AirNav leaves me no choice.The two coordinates I need converted:30R: 37-21.13533N / 121-54.91500W12L: 37-22.49933N / 121-56.41033W-Matt

simple arithmetic after you convert the lat/longs to decimal values.60 seconds in a minute, 60 minutes in a degreeso, 37 degrees, 21.13533 minutes converts into 37 + 21.13533/60 or 37.352256 degrees. Do this for all, and you can easily find the centerpoint. lat1+lat2/2 and likewise, long1+long2/2