like this???
///////////////////////////////
bmap bmap_minimap001="er.bmp";
bmap bmap_player_dot="player_dot.bmp";
var level_width[2]=1600,-1600;
var level_height[2]=1600,-1600;
var minimap_size[2]=256,256;
entity* guard_mdl_2754;
panel panel_minimap00
{
bmap = bmap_minimap001;
pos_x = 0;
pos_y = 0;
;

flags = refresh,visible;
alpha = 100;
layer=3;
}
panel panel_player_dot000
{
bmap = bmap_player_dot;
pos_x = 0;
pos_y = 0;

flags = refresh,visible;
alpha = 100;
layer=4;
}

function minimap
{
while(1)
{panel_player_dot000.pos_x = panel_minimap00.pos_x + minimap_size.x * (guard_mdl_2754.x/(level_width[0]-level_width[1]));
panel_player_dot000.pos_y = panel_minimap00.pos_y + minimap_size.y * (guard_mdl_2754.y/(level_height[0]-level_height[1]));

panel_player_dot000.visible=on;
panel_minimap00.visible=on;
}
}

I guess it should work now, but I really don't have the time to test it myself

...well it doesn't

You know, you all are saying great things, but reality is another:
(I'm making an economical strategy game, so I spend several hours finding, how)
--------
Code:

---

VECTOR mapsize;//Don't forget to set it in Main

function md_unit(var dx,var dy,VECTOR* fcol)
{	draw_line(vector(dx+1,dy,0),NULL,100);draw_line(vector(dx+1,dy,0),fcol,100);
	draw_line(vector(dx,dy+1,0),fcol,100);draw_line(vector(dx-1,dy,0),fcol,100);
	draw_line(vector(dx,dy-1,0),fcol,100);draw_line(vector(dx+1,dy,0),fcol,100);}
PANEL* minimap =
{
bmap = "p_map.tga";//at last, you can use a black square
}
...
ACTION unit
{
...
while is(my.FLAG1) //or 'While I'm alive'
{
...
md_unit(minimap.pos_x+my.x/mapsize.x*minimap.size_x,minimap.pos_y+my.y/mapsize.y*minimap.size_y,vector(96,96,224));
wait(1);
}
...
function main()
{
...
vec_set(mapsize.x,vector(2048,2048,0))
...
}

---

Maybe there must be for function for drawing a bitmap, but there isn't. So be happy to make anything by colored lines.
-------
Send me a reply if you know how to make a function for drawing a bitmaps.