Can't think of any reason for the compartment insert.
Bag is best I've ever had--removes with just a squeeze of button, easiest ever. (Well I once had a magnetic bag that removed as easily, including by itself while riding--not a problem with this one)
Doesn't interfere with bars--it's made for the bike, after all.
Height is adjustable.
If you mount your Navigator IV in center of handlebars you may not be able to see it with bag installed ... especially if adjusted to tallest height.
Bag is best I've ever had--removes with just a squeeze of button, easiest ever. (Well I once had a magnetic bag that removed as easily, including by itself while riding--not a problem with this one)
Doesn't interfere with bars--it's made for the bike, after all.
Height is adjustable.
If you mount your Navigator IV in center of handlebars you may not be able to see it with bag installed ... especially if adjusted to tallest height.