Will 0.86 gb of data be enough to use iPhone gps?

I'm an on call nanny, and only have 6 days left of my plan. However, I just got a few jobs.
I only have 0.86gb of data left. And I will probably need my gps for a total time of like 1 hour between all the jobs.
I have an iPhone 6, and I use standard view.

0.86 GB of data will disappear in no time.

How difficult will it be for you to buy a standalone GPS device. You can find simple ones for as low as US $ 60. This way you can use the data of your iPhone for other necessary stuff (like Texting, Face time etc!)while driving.

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