TIDAL WATER

ANCHOR
SCOPE

Calculate how much anchor rode to let out based on your depth, tides, and boat.
🛰️ Tide Station
📍
No station selected
Fetch tides via GPS or station search
Nearest Tide Station
GPS → nearest NOAA or CHS station
Prefer a specific station? Search by name or city:
Showing highest & lowest tide within the next 24 hours
⚙️ Boat Configuration
⛵
Vessel Setup
Enter your vessel measurements
▼
Units
ft
ft
Bow height / freeboard
ft
Anchor Rode Type
Chain+Rope
All Chain
All Rope
📡 Depth Sounder
Calibrated reading
ft
🌊 Tidal Range
Expected high water level
ft
Expected low water level
ft
⛓ Scope Ratio
3:1
Lunch Hook
Calm conditions
5:1
Typical
Good holding
7:1
Overnight
Heavy weather ready
?:1
Custom
Your choice
AUTO
Weather Recommended
Use GPS above to fetch conditions
Weather Conditions
—
Worst conditions forecast in the next 24 hours
💨
—
Peak Wind (kn)
🌬️
—
Peak Gusts (kn)
🌊
—
Peak Wave (ft)
—
⚠️ Please fill in all required fields (depth, high tide, and low tide).
❌
⚠ GROUNDING RISK
▸ Results
High Tide
—
feet
Low Tide
—
feet
Tidal Swing
—
feet
Rode to pay out
— ft
7:1 scope · 30 ft total depth
Depth Breakdown
Water depth at high tide — ft
Boat draft — ft
Pulpit to waterline — ft
Total effective depth — ft
🔄
Estimated swing diameter
— ft
Ensure clearance from other vessels & hazards
↕️
Under Keel Clearance (UKC)
— ft
At transducer only · assess seabed & footprint
🛟 Fair winds are free - servers aren't.
DONATION ACCEPTED
⚓ Notice to Mariners
This calculator is a planning aid only. Depth readings assume your sounder is correctly calibrated. Verify all tide data against current official publications. Always assess holding ground conditions at your anchorage. Conditions at sea can and do deviate from predictions. A properly sized anchor bridle or snubber is strongly recommended. Use sound judgment. Anchor at your own risk.