You need to get your user data into the universal GPX format, then it will be a straight import into Garmin. I am not familiar with Humminbird, but you can search the internet for various ways to make the conversion of your Humminbird file to GPX.
Relative to mapping advice, I need to know which specific Garmin units you have. The newest ones have Garmin Navionics mapping built in, so the exact units you have will dictate which mapping card would be most useful.
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