Fourth Window

reef in West Palm Beach

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Details

Open Water

Minimum Recommended Certification

Max Depth	60 ft
Average Depth	45 ft

Access

Hot Drop

GPS coordinates

26° 42.686' N
80° 00.966' W

Frequently visiting operators

	Pura Vida Divers
	Stuart Scuba
	Starfish Scuba
	Calypso Dive Charters

Upcoming trips (2)

Operator	Date	Time	Availability click-to-book	Trip Name click for details
Stuart Scuba	2025-08-30	08:00	-	Fourth Windows - Breakers Reef - West Palm
Stuart Scuba	2025-08-31	13:00	16	Elevator Shaft - Breakers - West Palm

Best Gas

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Diluent mix

Oxygen 21%

Helium 35%

Nitrogen 47%

Gas prices

Diluent tank	$35.50
O2 tank	$10.00

Diluent

Diluent PPO2 at max depth (60 ft) 0.9 atm

O2 Content Diluent

Set Point 1.2 atm

Set Point

END at max depth (60 ft) ft

He Content Diluent

O2 narcotic?

Loop temperature at depth °F/°C

Loop temperature

Consider H2O vapor?

Gas density g/L

Hypoxic at surface

Calculate Best Diluent

Gas mix

Oxygen Bottom PPO2

Helium Bottom PPO2

Nitrogen Bottom PPO2

Gas prices

Aluminum 80	$10
Steel HP 100	$10
Steel LP 85	$10

NDL at 60 ft - 24 hr min surface interval - m

Calculate NDL

Always use a dive computer

Nitrox

PPO2 at max depth (60 ft) Bottom PPO2 atm

PPO2 at average depth (45 ft) Bottom PPO2 atm

O2 Content

32%

Calculate Best Nitrox

Decompression planning

Site Description

Route

Typical Conditions

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