How can I download maps for other countries if my GPS has only map of North America loaded in it?

All GPS (Global Positioning System) devices would work anywhere on this planet, as long as the device has a clear visibility to the sky. Depending on the quality of your GPS, it may even work in area covered with trees. So, as far as satellite connection is concerned, be it Israel or any other country on earth, your Garmin device will certainly work.

In order to get the map of Israel loaded onto your Garmin device, you first need to purchase the map from the Garmin site itself or any other third-party seller. Since you mentioned that your device is of Garmin make, i would suggest you to purchase the map for Israel from the Garmin website.

When you purchase the map of Israel for your Garmin device, you can either download the map directly to your computer, or have an SD/microSD memory card loaded with the map sent to you. Before you make the purchase, ensure that your Garmin device is compatible with the map, which you can check by navigating to the 'Compatible Devices' tab on the Garmin website.

Once you have the new map of Israel downloaded, you should know the steps to load the new map onto your Garmin device.