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Presuming you do not have Amateur Radio licenses, or similar qualifications, you are then limited to various unlicensed options. The answer will then vary by region, but as you mention Canada, your best bet will be to use the GMRS/FRS (General Mobile Radio Service / Family Radio Service) which as basically replaced the old CB and walkie-talkie bands for ...

Battery consumption is determined by the software, too. Some stuff polls for new data, some takes GPS readings more often then others, etc. Honestly, I do not consider using a smartphone app for hiking or getting out into the backcountry. For too many of them you need network connectivity, battery life is a real issue (compared to dedicated GPS ...