DME Slant Range

Troubles with application

DME Slant Range

Postby hgrdrro » 01 Nov 2020, 14:59

Hi, I have a question regarding the DME distances calculated in FIF.
Are these distances the slant range as classic DME devices show (Altitude, if exactly above the DME antenna) or the real distance to the waypoint, airfield or naviagtion aid?
Best Regards Hans
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Re: DME Slant Range

Postby RogerF » 13 Nov 2020, 11:12

All GPS applications that I used so far show the horizontal distance.

You can test it in FIF using the simulation feature: you will see that whatever the altitude is, the DME shows zero when you overfly the point.

Actually, except for didactical purpose, it does not make much sense to program the slant in a GPS application, as this is rather an unwanted side effect of the DME technology.
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Re: DME Slant Range

Postby hgrdrro » 13 Nov 2020, 12:06

Thank's for your comment. I do not agree in all points. Because, if flying practice ILS approaches VFR according to the official IFR charts the shown distances are all based upon the slant distance to the DME-locator. But due to the fact that the difference between horizontal and slant distance is getting more and more the same as more I approach the runway and we all FIF users are flying VFR, it makes no real difference at all.
Best Regards Hans
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