Ask an Electronics Question, Get an Answer ASAP!
Hi Ren. Welcome to justanswer.
You need to download Garmin Express on your iMac which will install the latest maps and software updates on your device. To Download Garmin Express, CLICK HERE (Download the Mac version)
Once the download is complete, open the file and follow the on-screen instructions to complete the installation.
Reply once you are done installing the software.