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Unexpected Error During Login

Navionics® (a Garmin brand) and Garmin now share the same account. In case you also have a Garmin account (Garmin Connect™, myGarmin™, ...) using the same email address as your Navionics account, make sure to use the password you use to access your Garmin account.

Navionics Boating App

Make sure your device is running the latest version of the app from your app store.
Make sure your password does not include any special characters (e.g. "&", "?", "/", "\" etc.) as the app may not recognize these symbols and prevent you from logging in. If you need to change your password go to http://www.garmin.com/account and select the 'Forgot Password?' link.
If there is a SIM card in the device, try turning off Cellular and leave only your Wi-Fi connection turned on. If you still receive the error, try swapping and turn on Cellular and turn off your Wi-Fi connection.
Try connecting to a different Wi-Fi network or disconnecting from VPN.
Try going to http://www.garmin.com/account through a web browser to log into the website.
Is there possibly a security setting (virus or firewall protection) or an ad blocker on your network preventing you from logging in?
Try sending yourself a recovery password. Check your junk or spam mail for the incoming email, in case it was sent there.
If you have an Android device, try disabling Private DNS on your device.
If you have an Apple device, check Private Relay is disabled by going to your device Settings > [your name] > iCloud > Private Relay.

Computer Browser

Try connecting to a different Wi-Fi network or disconnecting from VPN.
Is there possibly a security setting (virus or firewall protection) on your network preventing you from logging in?
Try sending yourself a recovery password. Check your junk or spam mail for the incoming email, in case it was sent there.
Try clearing the cache of your internet browser.