2011 and 2012 RHB/CTP Chrysler Devices with Incorrect Time and Date

Incorrect Time and Date on 2011 and 2012 RHB/CTP Chrysler Devices Issue

Garmin has identified an issue with the 2011 and 2012 RHB and CTP Chrysler devices that causes the date and/or time to be incorrect after the GPS Rollover on April 6th, 2019.  This issue typically manifests itself after the battery has been disconnected or completely drained.  This causes the world clock page and the estimated time of arrival to be inaccurate.  All functions not dependent on the date and/or time will continue to work normally.  The positioning system will still have the same accuracy as before the issue occurred. 

What does that mean for my navigation system?

The date and/or time determined by the GPS will be wrong.  

Position, velocity, navigation, and all other functionality not dependent on date and/or time will continue to work normally.

Solution

Due to the age of the system/technology, there is not an effective/robust correction available. Although there is not a correction, there are steps to allow the system to display accurate information. 

To display accurate arrival time we recommend changing it from "Estimated Time of Arrival" to "Estimated Time to Destination". 

To change this setting:

1. Start a route to a destination

2. Touch View Map

3. Touch the map data field where the Estimated Time of Arrival is displayed

4. Touch Estimated Time to Destination

5. Touch Save or OK

To display accurate time we recommend changing the time setting to manual. This will allow you to manually adjust the clock to the correct time.

To change this setting:

1. Hold down the time displayed on your device's screen

2. Touch User Time

3. Touch the arrows to set the time

4. Touch Save

Note: when you change the clock to the manual time setting it will no longer automatically update the time zones

What is GPS Week Rollover?

The GPS satellite system transmits users the date and time accurate to nanoseconds.  In 1980, when the GPS system first began to keep track of time, the date and time were represented by a counter that could only count forward to a maximum of 1024 weeks, or about 19.7 years.  After 1024 weeks had elapsed, this counter "rolled over" to zero, and GPS time started counting forward again.  This first rollover occurred in August of 1999.  The second rollover occurred on April 6th, 2019.  Older GPS receiver components were not designed to account for this rollover causing them to calculate the incorrect time/date.