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The days of standalone GPS devices appear to be numbered thanks to the rise of the all powerful smartphone, but the downside is that phone screens tend to be small. This means that you are constrained by the size of phone you wish to use and so we would suggest that you can use your iPad to make the experience easier,safer and more fun. The fun side comes from the Waze app because it takes a different approach to what is on offer from other navigation services and the safety comes from having a larger screen attached to your dashboard. A cellular iPad helps a lot because it will have GPS built in, but location services still work well on a Wi-Fi iPad.