My friend bought a Garmin 62st and I tried to load City Navigator and 24K topo west maps onto a 16 GB micro sd card so that he could use it. The City navigator and the 24K west maps are in img format and they have different file names like cn_us.img & topo_24.img. I also have a combined map of City Navigator & 24K west which I renamed to gmapsupp.img. So I basically loaded all 3 files to the 16 GB sd card using a card reader and placed them in the Garmin folder on the sd card. I also have a gmapsupp.unl file that has the unlock code to unlock the City Navigator map.

So when I inserted the sd card and booted the 62st, I wanted to enable to combined joint map which I already named gmapsupp.img. However when I go to Maps, and select Menu to see the maps, I only see the maps that came pre-installed in the internal memory of the device. I do not see my gmapsup.img or the cn_us or the topo_24 maps from the sd card.

So I am hoping to find out what am I doing wrong here. Thanks in advance.