Very accurate and smart.
It tells how many services in your whole journey, once you are passing by one service station, it verbally tells you how far it is the next one so you can decide when to take a break during your journey. 
I have used it for more than a month and I found out it is  very easy to use, pretty accurate. live traffic information.
I prefer this one better than Google map which doesn't work on Huawei phone anyway. 
Strongly recommend you download and try it out. 
totally free and no bugs no advertisement.