This is true, not having a navy has shown itself to be a weakness of many nations/civilizations in the past. And there are also good reasons why this is so. Not having a navy strongly impacts a civilizations ability to maneuver around certain points and go around them. It also limits the ability to trade with other natons. Not to mention the additional value of having the firepower of ships (those that had cannons later on at least).
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A dissenting opinion disagrees with the majority because of the reasoning and/or the principles of law on which the decision is based. A concurring opinion agrees with the end result of the court but offers further comment possibly because they disagree with how the court reached its conclusion.