Anchor Chain Scope & Length

Rode Calculator for Boaters

$1.99 · Designed for iPad. Not verified for macOS.

Anchored in 25ft, blowing Force 6 at 2 AM - is 100ft of rode enough? Scope for chain or rope, swing radius, Beaufort and holding tables. $1.99 one-time, no login. Dragging anchor at 2 AM because you let out too little rode? Not sure which scope ratio to use for tonight's weather? This app calculates exactly how much chain or rope to deploy for safe anchoring. SCOPE CALCULATOR - Enter water depth, freeboard height, tide range, and weather conditions. Calculates required anchor rode length for all-chain, chain-and-rope, or all-rope systems. Shows minimum and recommended scope with swing radius. SCOPE TABLE - Quick reference for depths 5 to 100 feet at scope ratios 3:1, 5:1, 7:1, and 10:1. ANCHOR GUIDE - Compare Danforth, Plow/CQR, Bruce/Claw, Mushroom, and Navy types with holding power ratings and best bottom type for each. BEAUFORT SCALE - Wind speed to sea state reference (Force 0-12) with recommended scope ratio for each condition. Built for sailors, cruisers, and powerboaters. Supports metric and imperial. Works offline. No account or login required.

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Added a More Pro Tools section to discover related field calculators.

Version 1.0.3

The developer, Shanghai Sheyuan Network Technology Co., Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Shanghai Sheyuan Network Technology Co., Ltd.
    Size
    • 2.2 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Sheyuan Inc.
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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