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Fleet Based refers to Space Marine chapters not based on a homeworld. They possess only a fleet, one of the fleet ships usually serving as the Fortress Monastery. They are naturally among the most mobile chapters. Some fleet-based Chapters are also called Crusade Chapters. Many chapters who rebelled at some point but were granted forgiveness are fleet-based crusade chapters because they were forced to forfeit their homeworld.

Fleet-based Chapters

• Black Templars
• Blood Ravens
• Executioners
• Fire Hawks (destroyed)
• Invaders
• Knights of Gryphonne
• Lamenters¹
• Mantis Warriors
• Relictors
• Scythes of the Emperor
• Soul Drinkers

Sources

• ¹Codex: Blood Angels (5th Edition)