Sorry, I assumed you'd know how to use the command.
The way the command runs is like this.
 [Variable for X-Pos] [Variable for Y-Pos]
or, as an example:
getplayerpos 0x8005 0x8006
And then you'd need to move on to comparing the x value to the value of the map position, and the y to the value of the y position on the map.
I'm sorry if that makes no sense, I'm just not sure of how to explain it in only a few words.
Well, it depends a little bit on some other things, but you'd need to use command #42, which will get the player's x and y co-ordinates. It might be getplayerpos is XSE, but I can't remember off the top of my head.
I remember someone asking me if they could do that, and I said, yes. But I'm not too sure what ever happened to that. I won't be converting it, I just don't see the point. It's a pokescript tutorial, not an XSE tutorial.
I stopped the hack because I just had no motivation, and I felt like I should part from the idea, and maybe pick it up again later, but I don't know.
And command #42, just gets the player's x and y positions on the map.
Did you ever think you/someone else could convert your tut to XSE?
That would be a great help to some people, who can't use Pokescript.( I just convert your tut into XSE, but some people might not be able to do that.)
Also, why don't continue your hack? The titlescreen was awesome, and you'd probably have some awesome scripts in it.