ahramin
Perhaps I didn't explain it too clearly, but empty cruise seems to have cleared up the confusion. I was working on the assumption that the MDA and MAPt would coincide at a point on your nominal 3 degree glideslope. In reality you're going to reach MDA before the MAPt point. If, as you say in
Canada, the MAPt is the threshold, you're not aiming to get to MDA, of say 500' agl, at that point and try to pull off a succsesful landing from there!