you can script it like this, but it will annoy you with the sound
#loop
_alt = getpos player select 2
Hint format ["Altitude: %1",_alt]
~0.1
?getpos player select 2 > 1 : goto "loop"
exit
or you could use titletext instead but it flickers because of the loop
#loop
_alt = getpos player select 2
Titletext [Format ["Altitude %1", _alt],"Plain Down",0]
~0.1
?getpos player select 2 > 1 : goto "loop"
exit