Unused Script Question

[FrancPeinovich]

Hello, does anyone know how to get this unused condition to work? It's mentioned in the manual but I do not know how to make the program recognize it. It is "navalUnitInRadius." Or hex, none seem to work.

//Adriatic Blockade
$ModifyCountry
navalUnitInRadius=159,41,3,2,Allies
lifespan=continuous
actionCountry=8
PP=-1000
addReportTo=All
text=Adriatic sea blocked.
$End