The Challenger deck layout has been slightly modified from the standard layout to accommodate Marine Corps.

Deck 1
Main Bridge
Captain’s Ready Room
Briefing Room
Deck 2
Junior and Senior Officers’ Quarters
VIP/Guest Quarters
Deck 3
Officers’ Quarters
VIP/Officers’ Mess
Deck 4
NCO Quarters
Enlisted Crew Mess
Galley
Deck 5
Main Phaser and Fire Control
Auxiliary Control Room and Support
Impulse Engines and Engineering Support
Deck 6
Primary Life Support Systems
Primary Computer Core Control
Cargo Bay 1 & 2
Recreation Rooms 1 & 2
Deck 7
Computer Core
Sickbay
Chief Medical Officer’s Office
Primary Science Labs
Counselor’s Office
Deck 8
Computer Core
Junior Officers’ and Crew Quarters
Main Lounge
Secondary Science Labs
Fusion Power Generators 1 & 2
Deck 9
Interconnecting Dorsal/Intermix Shaft/Turbolifts
Forward Torpedo Bay Control
Forward Torpedo Bay Magazine
Armoury
Holding Cells
Chief Tactical Officer’s Office
Deck 10
Transporter Room 1
Interconnecting Dorsal/Intermix Shaft/Turbolifts
Forward Torpedo Launchers
Shuttlebay Hangar and Maintenance Sections
Deck 11
Upper Engineering Support Area
Machine Shop
Primary Maintenance Support Centre
Shuttlebay
Warp Core — M/A Reaction Assembly
Deuterium Storage Tanks
Deck 12
Main Engineering
Primary Systems Support Compartment
Living Quarters
Shuttlebay
Warp Core — M/A Reaction Assembly
Fusion Power Generators 3 & 4
Deck 13
Living Quarters
Primary Shuttle Maintenance Hangar
Main Deflector Axuiliary Systems
Emergency Batters
Fusion Power Generators 5 & 6
Aft Phaser and Torpedo Weapon Control
Warp Core — M/A Reaction Assembly
Emergency Transporter Rooms 1 & 2
Deck 14
Secondary Deflector Control
Living Quarters
Stellar Cartography
Cargo Bay 1
Warp Core — M/A Reaction Assembly
Impulse Engine Control and Support Centre
Engineering Section Impulse Engines
Enlisted Personnel Living Quarters
Deck 15
Recreation Deck/Zero-G Gymnasium
Crew Lounge
Deuterium Storage
Warp Core — M/A Reaction Assembly
Nacelle Power Transfer Assembly
Nacelle Personnel Transfer Conduit
Primary and Emergency Deflector dish
Graviton Polarity Generators
Subspace Field Distortion Generators
Enlisted Personnel Living Quarters
Deck 16
Tertiary Multipurpose Laboratories
Transporter Room 2
Emergency Transporter Rooms 3 & 4
Warp Core — M/A Reaction Assembly
Cargo Bay 3—Primary Cargo Bay
Cargo Bay 2
Cargo Bay 4
Transporters 2, 3, and 4
Deck 17
Waste Recycling
Environmental Control
Emergency Batteries
Brig
Secondary Computer Core
Anti-matter Generators
Gravimetric Polaron Generators
Secondary Shield Generators
Warp Core — M/A Reaction Assembly
Deck 18
Anti-matter Injectors
Warp Core — M/A Reaction Assembly
Emergency Gravimetric Polaron Generators
Tractor Beam Generator
Fore and Aft Tractor Beam Assemblies
Deck 19
Marine Command Centre
Marine Barracks
Bunker Rooms
Drill Area
Marine Armoury
Marine Shooting Range
Deck 20
Forward Torpedo Launchers 1 & 2
Tractor Beam Emitters
Living Quarters
Cargo Bay
Marine Barracks
Bunker Rooms
Deck 21
Docking Ports
Deflector Control
Library
Hydroponics Bay
Anti-matter Tanks
Deck 22
Crew Quarters
Transporter Room
Parts Storage
Secondary Computer Core
Deck 23
Emergency Batteries
Secondary Anti-matter & Deuterium Storage
Crew Quarters
Deck 24
Crew Quarters
Industrial Replicators
Phaser Control
Tractor Beam Control
Aft Torpedo Launcher 2
Deck 25
Brig
Ship’s Quartermaster’s Office
Exobiology Lab
Research Labs
Deck 26
Emergency Batteries
Shuttlebay
Shuttlebay Storage & Maintenance
Deck 27
Auxiliary Power Control
Power Relay Junction Network System
Warp Core Ejection Systems
Deck 28
Power Relay Junction Network System
Tractor Beam Emitter
Warp Core Ejection Systems

Deck layout adapted from Daystrom Institute Technical Library and ACTD.