Mastering naval combat in Like a Dragon: Pirate Yakuza in Hawaii hinges on upgrading your Goromaru's cannons – the most potent weapons in your arsenal. This guide details how to enhance these crucial ship armaments.
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Chapter 2 introduces Honolulu and Madlantis, the game's main hubs. Exploring these areas and recruiting crew members is vital for ship upgrades and story progression. During the main quest, you'll meet Julie, a mechanic who runs GearWorks in Honolulu. She upgrades the Goromaru and subsequently allows you to enhance its cannons.
Various materials are needed for cannon upgrades, obtained by defeating enemies. These include:

Speak to Julie, select the cannon you wish to upgrade, and equip them via the ship's crew formation menu. Here's a breakdown of the cannon types and their upgrade requirements:
Shark Cannon

The Shark Cannon offers elemental damage and a faster reload than others, but lower damage. Consider prioritizing stronger cannons and acquiring this later, perhaps alongside recruiting Julie.
Egesta Cannon

This cannon deals consistent damage over time, making it a strategic option. Its dual-shot compensates for the slower reload, offering diverse damage types compared to other cannons.
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Laser Cannon

The Laser Cannon is a top-tier weapon. Save your components for this devastating cannon, whose high damage output more than makes up for its slower reload. It quickly eliminates weaker ships and significantly damages bosses.
Super Laser Cannon

The ultimate cannon upgrade, requiring rare components obtained later in the game. Its superior power and long-range capabilities make it ideal for challenging battles in the Pirate Coliseum and against the Devil Pirates.
This guide covers cannon upgrades in Like a Dragon: Pirate Yakuza in Hawaii.
Like a Dragon: Pirate Yakuza in Hawaii is available now on PlayStation, Xbox, and PC.