Received in time, inserted and worked better than I thought with a Garmin Zumo 550.

I'm sure this item performs admirably. BUT BE CAREFUL WHEN ORDERING. Amazon's website can be misleading if you don't read carefully. I accidentally ordered the item in the wrong format...one incompatible with my GPS unit. Amazon's website implied that it was compatible; my fault...I didn't read carefully enough! I was unsuccessful trying to get satisfaction from the vendor so I am out $84; a bitter pill for retired fella to swallow. I have yet to try Amazon's Money Back Guarantee..........but I will try it and I hope to recoup some of my loss.

Using this product probably could not be more simple, all you really have to do is plug it in. After doing so I was finding Geocaches faster than before and was confident to travel places unknown afore. Not only does this card unlock new details on top of the basemap but many more features I had no idea my Garmin Colorado could do. Bought it from Amazon because they are trusted and only a few bucks off the best price I found on the net. If you have a Colorado I highly recommend this product. I didn't give 5 stars because the maps certainly are not flawless but come close I suppose. My one negative; and this is being very selective shall we say, is because a couple days ago coming back from a hike I called up the nearest gas station and the map was 0.15 mile off.

This is a mini SD card with an SD card adapter. I've had no problems finding any road from firebreaks to interstates. Works great to turn the Garmin Colorado 400t Handheld GPS Unit with US Topographic Preloaded Maps into an automobile navigation unit as well.

Works great! I had no idea that the software would be so sophisticated. I use it all the time to navigate the streets in Atlanta.