I received this e-mail from mysatnav.ie today.
Marion
Please update your Garmin sat-nav firmware immediately!
If you own a Garmin nüvi 7x5 series sat-nav, for example, a 765T or 775T please go to Garmin's web site immediately and update the firmware on your device to Version 3.60. It is VERY IMPORTANT that you do this.
nüvi 765T - Update to Garmin Firmware Version 3.60
nüvi 775T - Update to Garmin Firmware Version 3.60
Last Monday, 22nd June, a number of owners of 765T and 775T started to report problems acquiring satellites on their devices. Evenutally the units would power down and it is impossible to restart the sat-nav - they are completely dead and have to be replaced by Garmin.
We spoke to Garmin and while they are loathe to say what is wrong we think there is a bug in the current firmware version 3.3 that is related to the almanac on the device.
The long and short is that this bug could completely kill your GPS and you could lose all the locations that you have saved on your device.
Garmin have released a firmware update, Version 3.6, so before you do anything with your device today - make sure you update it.
This email has been created in haste because it is very important that owners of Garmin nüvi 7x5 devices update the firmware on the units.
If you have friends or colleagues with nuvi 765T or 775T please forward this email to them.
Thanks,
John
mysatnav.ie
Marion