Originally Posted by Jeff
Unfortunately you cannot read/copy the charts even using the necessary Garmin card reader. You can copy/save waypoints and routes using the reader and mapsource software. ...... unless anyone knows different
All garmin charts (as far as I can tell) requite an unlock code which locks that chart to a particular device, be it the plotter or a PC but I'm pretty certain you can still physically copy the data onto a PC. You would not be able to use it on another plotter (or on PC) without another unlock code but you should still be able to backup to the PC. I may be wrong!
You can get the charts on DVD / CD ROM (like bluechart) which is coverage for atlantic for example and then you select what area to unlock and then download it to a standard card so that infers the format is standard and data is standard and it's not locked to the card.
See the section on Mapsource and CD/DVD
(Is the card a Garmin one or normal SD/MMC?)
When I got my Navionics charts (which are locked to the physical card) I called the tech support guy as I wanted to back them up and he said they could be copied to the PC but would only work from the card they shipped with (but at least if the data got corrupted I could restore it).
May be worth submitting a help desk ticket or calling Garmin UK (if you have the patience to wait on the phone!)
Just another though - If Garmin already have a log of the unit (which they would have to have had for unlocking the charts originally, they may be able to assist you based on that unlock code). See