Originally Posted by zboss
So that gives credibility to my supposition that the data formats are the same between the old cards and the new cards. You should just be able to download the new data and add it to your old card... I would experiment
first on a card that is not you existing card.
I don't know specifically about the data format, but the Bluechart data card itself is a unique Garmin proprietary format. It can be read by a PC, but only with the USB-attached Garmin Data Card Reader. Drivers for this reader work only with 32-bit Windows systems, not with W7 64-bit or newer. Garmin wisely switched from this format to SD cards with its 4000-series chartplotters maybe 8-10 years ago.
As far as I have been able to tell, the Garmin BlueChart data cards sold containing charts
cannot be written to, but there are blank ones of various sizes than can be written to. I use one to save routes and waypoints from my 2006C chartplotter
, than transfer them to a W7-32bit computer using Garmin's Homeport software
. From there the info can be moved to an SD card and made available to newer chartplotters.