SUMMERLAND GP @ GRINDSTONE ISLD. MAP

The **CHS Nautical Chart 1437** (CM1437) from **Fisheries and Oceans Canada** delivers precise marine navigation for the **Summerland Group to Grindstone Island** in the **St. Lawrence River**, covering this vital segment of **America's Great Loop** at a detailed **1:25,000 scale**. Essential for safe passage, it features comprehensive soundings, depth contours, hazards like reefs, shoals, and wrecks, plus maritime regulations and aids to navigation. Ideal for **cruising**, **sailing**, **fishing**, and **commercial operations**, this official chart—updated with the latest Notices to Mariners—ensures reliable charting for boaters transiting these Canadian waters.