I just posted a lengthy reply with details to this version of your thread:
https://www.winnipesaukee.com/forums...d.php?p=383097
I didn't want to duplicate it here, but saw the other thread first!
Everyone that uses a Garmin device, please report this to Garmin and/or Navionics and use the reference code CER-2015 so that the many problem reports can be referenced together.
Downeast, I suggest you add your code also, or also add the CER-2015 to your problem report.
See this thread for technical details:
https://www.winnipesaukee.com/forums...d.php?p=383097