It's a very nice feature to have. It shows at a glance which sites can
be reached at an altitude you've specified during your setup of the program.

I have no experience with iGlide, but with XCSoar there is displayed
(user selectable) a "glide amoeba" which outlines the area the glider
can reach given the current polar, weight, altitude, wind, terrain,
etc. Airfields are also colored green within the outline. With
ClearNav, there is a double concentric "glide amoeba". The outer one
shows the point where the glider will land under the above conditions,
and the inner one shows where the glider will be at a user selectable
altitude.

Check your user manual/help files for how to set it up on your device.

Dan

On 2/5/2017 7:22 AM, wrote:
Does iGlide show the reachable landing sites in the current McCready setting ?
Oudie changes landing sites color to Green for reachable sites.
In any case, how important is this feature ?
Dan

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Dan, 5J