will under volting keep nav from over heating?

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When i run Navigation it over heats after a few miles and locks up have to pull bat. Will under volting help?

In theory yes, it would stay cooler (at least for a little while), but i wouldn't know if it will be stable.
You could also lower the cpu voltage.
It could also be a problem with the app itself, for example:
When I played this game called TrialX, it would lock up all the time if i played it.
but when i tried TrialX 2, which has better graphics (and thus would need more CPU power), it never locked up.
So you could try another nav app.

hope i have been of help.