There is only one source of bathymetry data in Canada that I'm aware of, and that's the federal government, so all mapping should be pretty much equally terrible.
There's a couple of reasons why bathymetric mapping in Canada is terrible in general, and they both have to do with the fact the federal government is in charge of all mapping and data through the oceans and fisheries department.
The first issue is that all mapping that currently exists was done by the feds, and much of it dates back to the 50s and 60s, when a lot of it was quite literally was done with a hand auger and a lead weight on frozen lakes, often on a 1 mile grid. There is zero money available for the updating or improving of this data, so what you have is what you get.
The federal government is also the main reason why Navionics, Lake Master, Garmin, etc... have not conducted any bathymetric surveys or provided any detailed lake mapping like they do in the USA. #1, there's a massive amount of red tape and hoops to jump through to get permission to do the surveys, and #2, the federal government charges a large royalty on the sale of any map data that's produced and sold, effectively taking away their profit margin. Those two factors will pretty much ensure that you won't see any mapping produced and sold by the sonar or map companies for the fresh water lakes in Canada, particularly western Canada, unless there's a change in legislation.
They've worked around those rules with the crowd sourced maps - CMAP Genesis, Navionics Sonar Charts, etc... by claiming the data is voluntarily supplied by the users, and they are only the middle man, and thus are exempt from the royalty.
The size of the market is obviously a factor too, they're not going to sell as many maps in AB/SK as they are in MN/WI, or AL/TX, so the potential return on investment isn't there to warrant the upfront costs and hassle involved.
I have no experience with Garmin, but from what I've seen, the Navionics+ mapping is the best of the worst by a fair margin.
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