This is pretty irrelevant to the actual conversation but, it's honing isn't it? Have I been saying it wrong this whole time?
To hone is to sharpen or to perfect. You can hone a blade.
Home in is the phrase that has more widespread use. A missile homes in. It probably has roots to do with homing pigeons.
I always thought that it should be home, but heard it more often as hone, so I figured there must be some etymological history I was unaware of. Apparently I just had a bad sample set.