Professional marine tool that determines exact scope ratios, holding capacity, and swing clearance based on real wind and bottom conditions.
Updated 09.10.2026 with enhanced scope calculator
All promotional codes valid for new installations. Features require active subscription after trial period. Standard data rates apply for weather integration.
Tower Quest eliminates the guesswork from anchoring by computing the exact relationship between water depth, anchor rode length, and expected wind loads. The application considers tidal range, bottom composition, and your specific anchor type to determine whether your setup provides adequate holding power throughout your stay.
Traditional anchoring advice relies on rough ratios that rarely account for changing conditions. This tool continuously recalculates your scope-to-depth ratio as tide levels shift, alerting you when your anchor rode becomes under-scoped before your boat begins to drag. Wind speed squares the pulling force, so the calculator applies quadratic load formulas rather than linear approximations.
The map interface displays your boat position relative to nearby obstacles, calculating clearance distances as your vessel rotates around the anchor point. You input the locations of shallow banks, moored vessels, and fixed structures, then the system determines minimum safe distances accounting for both your swing radius and their exclusion zones. Real-time updates show when wind direction changes will bring you closer to hazards.
Compare holding characteristics across eight anchor designs including plough, wing, scoop, and claw types. Each entry shows verified holding multiples measured in clean sand, with adjustments for six bottom compositions.
Input current depth and watch as the tool computes required rode length for your selected safety margin. Tidal adjustments automatically recalculate scope as water level changes throughout your anchorage period.
Set expected maximum wind speed and the system calculates pulling force on your ground tackle. Holding capacity of your anchor is compared against predicted loads with clearly displayed safety margins.
Visual representation of your vessel swing circle with distance measurements to nearby boats and shallow areas. Clearance values update as you adjust rode length or reposition anchor location.
Immediate warnings when calculated scope falls below safe thresholds or when swing radius intersects with marked hazards. Color-coded status indicators show current anchoring security level at a glance.
Choose from clean sand, soft mud, firm clay, weed-covered sand, and mixed bottoms. Each selection adjusts anchor holding calculations using documented performance data for accurate predictions.
Created by experienced cruising sailors who encountered repeated anchoring failures using traditional rule-of-thumb methods. The development team combined naval architecture principles with real-world testing data to produce calculation algorithms that reflect actual holding performance across diverse bottom types and weather conditions.
Android platform • Free download • 18 MB • Installation completes in 90 seconds
Download Tower QuestRequires Android 7.0 or higher. Premium features available via in-app subscription. Application rated for general audiences. Contains no advertisements in free version.