Hi, thanks very much for the instructions. Just processed the original .img file through v1.5 unlocker and it went without a hitch. I noticed the the IMG map file name did not change, so I assume this is normal for this release. Will get a chance to hopefully try the SD card tomorrow on the 440S. GPS has to be tested on the boat itself as there is no spare 12v cable to power it up elsewhere.

I also updated the file in my microSD card for the Nuvi 255 but it still only shows the green Fishing Contour lines over open sea. Guess the Nuvi was never designed to handle a G2 chart.

Will let you know the results. Thanks again for your time, and great forum!