Gps shuts off regularly - Garmin nuvi 2455LMT

As you probably know, the GPS device needs to get a satellite signal to determine its (your) location, before it can be used.
When the device is having difficulties getting that information, that message is displayed.
A common reason for not being able to get the signal is when there's physical barriers between the device and the satellites, e.g. when you're in a building, under certain covers where there's little/no line of sight between the device and the satellites.
Sometimes, even when this is not the case, the GPS has difficulties getting satellite signals.
So, getting an update (from the tomtom webiste) of the satellite locations can help. Just connect your GPS to the tomtom website, using tomtom HOME (the software), and get the QuickGPSfix update (a very small file) installed on your GPS device. It is suggested you update this data regularly ( as it provides a better location of the satellites, for the GPS device to search)
If you've already done that and the GPS still have problems locating the satellites, try to reboot the GPS. This can be done by holding down the ON/OFF button (for quite a while, e.g. 30 seconds or more) ... to shut the GPS down, and then turn it on again. Or, use a pin (e.g. paper clip) to press the "RESET" pin-hole, to turn it off, and start the GPS device up again.
Hope this helps.

As you probably know, the GPS device needs to get a satellite signal to determine its (your) location, before it can be used.
When the device is having difficulties getting that information, that message is displayed.
A common reason for not being able to get the signal is when there's physical barriers between the device and the satellites, e.g. when you're in a building, under certain covers where there's little/no line of sight between the device and the satellites.
Sometimes, even when this is not the case, the GPS has difficulties getting satellite signals.
So, getting an update (from the tomtom webiste) of the satellite locations can help. Just connect your GPS to the tomtom website, using tomtom HOME (the software), and get the QuickGPSfix update (a very small file) installed on your GPS device. It is suggested you update this data regularly ( as it provides a better location of the satellites, for the GPS device to search)
If you've already done that and the GPS still have problems locating the satellites, try to reboot the GPS. This can be done by holding down the ON/OFF button (for quite a while, e.g. 30 seconds or more) ... to shut the GPS down, and then turn it on again. Or, use a pin (e.g. paper clip) to press the "RESET" pin-hole, to turn it off, and start the GPS device up again.
Hope this helps.

From the saved data when you backed it up on the computer. Use Garmin Express to transfer.

How to Backup User Data from GPS 72/76 or GPSMAP 76/76S

https://support.garmin.com > en-CA
It is recommended to occasionally back up the user data on your GPS 72/76 or GPSMAP 76/76S. User data includes waypoints, routes, tracks, and geocaches.

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  Transfer User Data From MapSource to a GPS 72/72H/76 or ...

  https://support.garmin.com > en-CA
  To transfer user data, such as waypoints, routes, and tracks from the MapSource program to these devices, some additional equipment will be required.
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  Manually Creating Waypoints on GPS 72/76 or GPSMAP 60 ...

  https://support.garmin.com > en-CA
  Press and hold Enter · Wait for the New Waypoint screen · Release Enter · Highlight the Coordinates field · Press Enter · Adjust the coordinates as desired with the ...
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  Backing Up Userdata (Waypoints, Routes, and Tracks) From a ...

  https://support.garmin.com > en-CA
  Before updating device software, it is recommended that you back up user data like waypoints, routes, and tracks. This should be done at regular intervals ...

Usually the regular USB cords work just fine with such devices.

This screen is called the "Development Screen". It appears when the internal files on the GPS are corrupt. The unit needs to be reflashed because you have corrupted file(s) onthe internal memory of the unit.

DGPS only works in areas where there is a DGPS beacon, and they're simply not that commonplace. Unlike orbiting GPS satellites, DGPS beacons are fixed land based devices.

When there's no DGPS beacon, the unit automatically reverts to the regular and slightly less accurate GPS.

Just push the regular off button. It may take a time or two but hold the off button for about 5 seconds it will shut off then.

There's no problem. Use SD card.

Probably a com port setting. I'd call tech support, have them walk you through it.

Hello,

Reset your GPS and it should be able to give your factory settings back. To reset, if its Garmin GPS , one your switch on your GPS, hold the power on button on your gps to ON position for more than 7 seconds and it would reset on its own, leave the button and you would be with regular factory settings in English language. Note: Resetting your model of gps to factory settings may have different procedure, but RESET is what you should be doing to get back to regular setting to english.

---Sandy.