The most popular sizes for a navigation system’s display are 5", 6", and 7".
However, models as small as 3.5” are widely available. Most people with average vision find a 5" screen quite comfortable, but that opinion changes if the unit is mounted in a larger vehicle, such as a van or RV.
Drive confidently with personal navigation devices designed for cars, trucks, motorcycles and RVs.
Yes, it is possible to use your smartphone for navigation, but you're also using it for a half dozen other tasks.
And, picking your smartphone up to study a tiny map is just as dangerous as texting and driving.
In many cases, a wiser option is using a dedicated navigation system.
Touch screen control has always been a feature of satellite navigation systems, and some models now offer a pinch-to-zoom function.
However, on-screen controls require you to look away from the road and take a hand off the wheel.