Which of the following best describes the navigational hazards on Lake Ontario?

The statement that significant dangers are concentrated in specific areas accurately reflects the nature of navigational hazards on Lake Ontario. While it is true that hazards can exist throughout the lake, certain regions, such as near shoals, channel entrances, or areas with submerged rocks, are more prone to present serious risks to navigation. Understanding that these dangers often cluster in particular locations helps boaters remain vigilant and exercise caution in those areas, as they are likely to encounter more challenging conditions.

The other options suggest a misunderstanding of the scope and distribution of navigational hazards. For instance, stating that only large vessels experience hazards does not recognize that smaller vessels can also face significant risks, particularly in shallow or congested areas. The assertion that most hazards are marked may overlook the fact that not all hazards are adequately signposted, which can lead to dangerous situations if navigators rely solely on markings. Lastly, the notion that there are only minor shoals throughout the lake does not accurately convey the varying levels of danger presented by different submerged features, which can range from minor hazards to serious threats depending on their location and conditions.