Well, many times users have asked us the same question, the answer is yes, you can.
You can easily update your Garmin Nuvi without Garmin Express as well. If you have myGarmin account, you can update your Garmin Nuvi through your account as well. For this, you will need to visit the Garmin website > Log in to myGarmin account > explore the updates > Install.
Apart from that, users can download the free maps through the openstreetmaps.com website.