I hope this isn't an extremely stupid question (or maybe it is better if it is so that it can be solved quickly ), but I'm having trouble viewing unlocked bluecharts on my garmin gpsmap 451. I've tried both the unlocked spain and portugal map as well as the eastern caribbean map. What I did was
1. Copy the .img file to a folder called "Garmin" on a blank SD card
2. Put the sd card into the plotter
Then, when I booted up the device, it recognises the map but I get a message saying cannot unlock map. I definitely downloaded unlocked versions of the maps, so I'm not sure what I am doing wrong.
Also, I'm not sure if this is relavent, but after trying the sd card in the plotter and putting it back in my pc, it seems the plotter added an XML document called GarminDevice to the card.