Heian Maru
The Heian Maru is a historic dive site located in Truk Lagoon, Federated States of Micronesia. This passenger-cargo ship, constructed in 1930, measures 155 meters in length and rests at a depth ranging from 10 to 35 meters. As the largest shipwreck in Truk Lagoon, it offers divers a unique and captivating experience.
Exploring the Heian Maru, divers will discover vast passageways, including an expansive bridge and engine room. The wreck's structure is adorned with an abundance of hard and soft corals, creating a vibrant and colorful underwater display. Additionally, various species of fish call this site home, providing divers with an up-close encounter with marine life.
With optimal visibility reaching up to 19 meters and a maximum depth of 28 meters, the Heian Maru attracts advanced-level divers seeking a thrilling underwater adventure. Located in Chuuk, Federated States of Micronesia, this dive site offers a mix of history, marine biodiversity, and awe-inspiring beauty.
Exploring the Heian Maru, divers will discover vast passageways, including an expansive bridge and engine room. The wreck's structure is adorned with an abundance of hard and soft corals, creating a vibrant and colorful underwater display. Additionally, various species of fish call this site home, providing divers with an up-close encounter with marine life.
With optimal visibility reaching up to 19 meters and a maximum depth of 28 meters, the Heian Maru attracts advanced-level divers seeking a thrilling underwater adventure. Located in Chuuk, Federated States of Micronesia, this dive site offers a mix of history, marine biodiversity, and awe-inspiring beauty.
Diving Conditions Score for Heian Maru
7
GoodGood diving conditions!
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Heian Maru
Depth
28m
Visibility
19m
Experience Level
advanced
Weather Conditions for Heian Maru
Wave Height
0.7m
Wind Speed
16.5 m/s
Water Temp
29.9°C
Visibility
12.56km
Cloud Cover
98%
Wave Period
6.8s
Air Temperature
28.7°C
Precipitation
0 mm
Detailed 7-Day Diving Forecast for Heian Maru
Alpha
Dive Score Chart for Heian Maru
Best time to dive: 17:00 with score 7.813623004694835/10. Water conditions: Waves 0.7m, Wind 14.3 m/s.Best night dive time: 0:00 with score 7.352138164251207/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Heian Maru: 06:00
Sunset at Heian Maru: 18:00
Optimal diving conditions at Heian Maru are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.
Best Overall
17:00Score: 7.8/10
Waves: 0.7m (7.1s), Wind: 14.3 m/s
Best Night
0:00Score: 7.4/10
Waves: 0.7m, Wind: 9.9 m/s
Seasonal Analysis for Heian MaruAlpha
Historical patterns and best seasons for diving at Heian Maru
The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.
Monthly Dive Score Analysis - Seasonal Diving Conditions
Higher values indicate better diving conditions
Seasonal DiveScore Chart
This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.
Higher values indicate better diving conditions
Best Season for Heian Maru
Winter
Avg. Score: 9.4/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Heian Maru
January
Score: 9.6
February
Score: 9.5
December
Score: 9.2
Ideal Conditions for Heian Maru
Water Temp
27.0°C / 80.6°F
July
Visibility
9.8m / 32.2ft
January
Wave Height
2.2m / 7.2ft
September
Wave Period
8.0s
January
Seasonal Insights for Heian Maru
Heian Maru shows typical northern hemisphere patterns with June being the warmest month (27.2°C) and December the coldest (23.9°C). The calmest conditions typically occur in September with average wave heights of 2.2m and wave periods of 8.0s. The most comfortable wave conditions are in September with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). January is usually the driest month with 0.7mm of precipitation. For beginners, the best time to visit would be during September to November, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.
Last updated: 1 min. ago - Jun 21, 2026
Note: This dive site is not a verified dive site. Please dive with caution. This dive site might have incorrect information by the community.
4 Dive sites near Heian Maru in
Got feedback?
Help us improve this dive site by giving us feedback.