None of the sonar brands currently on the market have detailed built in maps for Alberta. They will have base maps, which have a lake outline but no real depth detail.
The best option for you is to buy a sonar system that allows you to build your own maps as you drive around the lake with the sonar on. On a Humminbird that feature is called Autochart. It’s available on the newer Helix 5 and up. You need to buy the Autochart micro SD card to use this. Once you do you put it in the card slot of the unit, turn on Autochart on the head unit, and let it create a map while you drive. The following is a photo with the map on the left side being an example of a map I built using Autochart:
The other option is to download community generated maps, if available. This option is really limited at the moment as it seems people only upload a pass or two on a lake, so your info is limited.
The detailed map chips like Lakemaster are simply not available for Canada outside of Ontario’s Great Lakes and Lake of the Woods.