Had the same problem with my 113C. Checked my wiring under the console and redid it per Ranger. Let dry out overnight and then reconnect using dielectric grease. Updated the firmware and did a hard reset (be sure to write your coords down). After all of this, it was only operating about half the time.
Brought the boat in for warranty work and the dealer figured it out. It was the NMEA connection at the back of the boat where the temp sensor was. I remembered I lost water temp a few weeks before I lost the GPS module. Both work great now.
You do want to check your firmware. That was the first question the dealer asked.
Hope this helps.
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