What you could do is:
a) Download an older version of the software to an SD card. Make sure that .bin
file is the only thing on the card.
b) With your machine off, put the SD card (with the old version) in your machine
and turn the machine on.
Answer Yes to do you want to replace, and No to do you want to abort.
c) If your system comes back. Export all your NAV data to an SD card for
backup.
d) Download the newest version of the software and put it on an SD card, and
make sure it's the only .bin file on the card.
e) Re-boot your machine, set unit back to default, place the SD card with the newest update
in, answer the questions the same way, reset unit back to default.
f) Bring your NAV data (on the SD card) into HumminbirdPC and look through it, delete duplicates, and see if everything has valld coordinates.
g) Try and get the google earch tracks into your DATA.HWR file using HumminbirdPC or
maybe some other type of conversion software.
h) When you are sure that your NAV data on the SD card is fixed, then delete all
NAV data from your unit.
i) Put the SD card in with your modified NAV data and let it load back into your
machine.
Good Luck