HulvantiKez

HulvantiKez is a landscape mariner's watercolor desk for quick radio and rig math on deck. Everything runs on your iPhone with no account and no network.

Getting started takes a minute:

1. Open the app and swipe between the two benches on the top bar — Horizon Reach for VHF range, Canvas Span for sail area.
2. In Horizon Reach, set your antenna height and the other vessel's antenna height (meters or feet). Tap Calculate to see line-of-sight range in nautical miles, kilometers, and statute miles. Use marine presets for handheld, day sail, coastal, or offshore setups.
3. In Canvas Span, pick a sail profile (triangle, trapezoid, or full roach), enter luff, foot, and roach percent, then Calculate to read area in square meters and square feet. Dinghy-to-cruiser presets load common rig sizes instantly.
4. Tap Save to store any result in your on-device log, open Saved to filter by tool, and Share to send plain-text summaries to crew. Settings let you toggle sound, haptics, and metric units.

Built for skippers, racers, and coastal planners who want honest numbers before a watch or a sail change.