Hi, I am the author of Legion XVII: Roman Legion at War and Legion XVII: Battle of the Danube. I just received a 1-star rating for Battle of the Danube because the reader was turned off that I put the metric equivalent in parentheses following a notation of yards or miles. He stated that it was like watching TV and continually being interrupted by commercials. He said it hurt the flow of the book for him. Here's what it looks like in the book: ...17 miles (23 km)...
I did not use this technique in my first book. I used it in the 2nd because I read a book from the UK that only used metrics and I had to constantly convert distances and weights. That made for a difficult read.
I'm mid way into my 3rd book and I've been putting the metric equivalent in parentheses like I did in Battle of the Danube. No other readers have posted a similar comment, so I'm unsure how big a problem it really is.
I would appreciate reading your thoughts on this.