[a_c_s]

I have hardly any lag using TeleNav 5.16 (upgraded the stock Sprint Nav on the phone, still a free app if included in your plan) and a moderate lag on Garmin...but with turn preview activated, I never miss turns anyway...it's probably a second lag but at 60mph I can see why some people complain about it...in any case, I'm not that anal, use GPS regularly, and am happy with TeleNav and Garmin on the Touch Pro...but there is a known lag problem...there are some fixes on the XDA forums but they can get complicated so I've just stuck with the stock GPS setups...