Yes that's what I meant. Thanks for the reply. I think an external mic is worth it. In my case too much ambient/tractor noise in the Pajero for an in-head-unit mic!
Do you mean in the Pioneer unit? In which case yes, it had an external mic you could route to a sensible location, which in this case was up above the speedo/rev counter dials under the dash lip.
Works extremely well, where as the inbuilt mic in my China stereo doesn't work very well at all, unless you should hard out.