Cost. They would probably each cost at least $100 more, if not more. Not everyone uses the GPS feature so that extra cost for a feature they don't use would drive them away from purchasing. This way, those who want GPS can purchase it and those who don't aren't stuck paying for it.Especially with the handheld, why not build the GPS into the radio?
Did you see the word MAY in my post? Your results are no guarantee that everyone would have the same results.I beg to differ. My ID51 D Star radio is clipped to my visor and I have no problem getting GPS signals. I think built in GPS is a great idea. What's another few bucks when you're already paying six bills?