Descent Angle and V/S
In the Jeppesen Approach charts, under the profile view the required vertical speed to remain on profile for the respective descent angle is mentioned. But for the same descent angle and ground speed the vertical speed mentioned sometimes varies.
For example in Kuwait for chart 18-1 with a descent angle of 3 degrees the V/S required is 637 for G/S of 120 kts but for Male Airport (VRMM) chart 11-1 with a descent angle of the same 3 degrees and GS of 120 kts the V/S required is 646
It beats logic. Can someone please explain?