Well, it is physically possible then to 'hover' by the scope or by continuous trimming (noise or no noise)
One thing I do notice in the book, is that the author is continuously jotting down notes of his experiences, and a lot of the items look technically sound.
The guy is not a technical person at this stage, so he might have some things incorrect (I've picked up a few items), maybe from memory.
There's a lot of technical info, between the lines, so to speak
