What sonar units are you using?
With most of the Lowrance units, you can download the C-MAPS Genesis Social Maps for free. Many of the lakes in AB and SK have been mapped in detail. You can also make your own maps for free using Genesis Live. All you need for both apps is a blank micro SD card.
The Navionics maps are generally decent quality, the best of the mapping chips you can buy in my experience, but the depth contours will NOT be very accurate, they are just a guideline.
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