I also put my vote in for Navigon (and the update that is coming up sounds pretty awesome).
But I will say you might want to investigate TomTom. Just judging from reviews of people who have tried both, I get the impression TomTom is a little better at routing and finding you the least traffic or most efficient route.
But I've had no big issues with Navigon (save one area in Atlanta where it does not realize there is an exit going North from 285 leading it to do some really interesting routing decisions).
Both from what I've read are pretty good. Both give you the maps on the iphone. Navigon is changing it a bit so you stay what state you are going to be in (or states) so it will only store that map until you tell it otherwise (this is really nice cause, um, well, Navigon right now is a 1.7 GB app to be able to hold all the maps). They're also from what I read improving the UI better so that you can access things better that you'd need to while driving (right now it's got terrible UI if for some stuff you might want to do while you are driving, for example finding points of interest that happen to be nearby where you are at).
I know you can listen to the iPod too while using Navigon and it will soften the music when it needs to tell you an upcoming turn and I am assuming that TomTom has something similar (I could be wrong though). They both seem to mimic a lot of functionality (just do it differently).
Also, from what I understand (and I could be wrong, it's been a long time since I've perused the best GPS app threads, there is one around here that is pretty old asking between TomTom and Navigon and I suggest you find it, it has some very useful comparisons, it is how I decided on Navigon honestly), Navigon makes you pay once to get traffic updates where as most other apps want a yearly fee for that. Here, found that one thread for you: https://forums.macrumors.com/threads/953835/ but there are several others also discussing this (and that thread is old so a bit outdated info but should give you a general idea of differences between the two. On the last page some one does a very detailed review on both of goods and bads he found of both that was earlier this year. They haven't changed that much since then that it should still be pretty relevant).
Also, I will second the opinion that Navigon's POI stuff sux (it never seems to find anything for me). But, there is a free app, White and Yellow Pages, that is great at finding POI's that works with Navigon (it has a button that you can hit to tell it to give you instructions using Navigon) so that makes up for it.
But I will say you might want to investigate TomTom. Just judging from reviews of people who have tried both, I get the impression TomTom is a little better at routing and finding you the least traffic or most efficient route.
But I've had no big issues with Navigon (save one area in Atlanta where it does not realize there is an exit going North from 285 leading it to do some really interesting routing decisions).
Both from what I've read are pretty good. Both give you the maps on the iphone. Navigon is changing it a bit so you stay what state you are going to be in (or states) so it will only store that map until you tell it otherwise (this is really nice cause, um, well, Navigon right now is a 1.7 GB app to be able to hold all the maps). They're also from what I read improving the UI better so that you can access things better that you'd need to while driving (right now it's got terrible UI if for some stuff you might want to do while you are driving, for example finding points of interest that happen to be nearby where you are at).
I know you can listen to the iPod too while using Navigon and it will soften the music when it needs to tell you an upcoming turn and I am assuming that TomTom has something similar (I could be wrong though). They both seem to mimic a lot of functionality (just do it differently).
Also, from what I understand (and I could be wrong, it's been a long time since I've perused the best GPS app threads, there is one around here that is pretty old asking between TomTom and Navigon and I suggest you find it, it has some very useful comparisons, it is how I decided on Navigon honestly), Navigon makes you pay once to get traffic updates where as most other apps want a yearly fee for that. Here, found that one thread for you: https://forums.macrumors.com/threads/953835/ but there are several others also discussing this (and that thread is old so a bit outdated info but should give you a general idea of differences between the two. On the last page some one does a very detailed review on both of goods and bads he found of both that was earlier this year. They haven't changed that much since then that it should still be pretty relevant).
Also, I will second the opinion that Navigon's POI stuff sux (it never seems to find anything for me). But, there is a free app, White and Yellow Pages, that is great at finding POI's that works with Navigon (it has a button that you can hit to tell it to give you instructions using Navigon) so that makes up for it.
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