Switching GPS on off

Hi, phone is Sony Xperia Z1 running 4.4.4, I've installed Tasker and AutoTools and successfully run adb command line to allow WRITE_SECURE_SETTINGS. But I can't get Tasker to turn on GPS. Any ideas? Is it possible? Thanks. (phone is not rooted, i was hoping Auto Tools would make that unnecessary)

EDIT - ignore me I was doing it wrong! Works - what a great app!