import type { MetricField } from './contract';
export declare const MS_TO_KN = 1.94384;
export declare const SOG_VALID_KN = 0.4;
export declare function beaufort(ms: number | null | undefined): number | null;
export declare function beaufortFromKn(kn: number | null | undefined): number | null;
export type SystemTab = 'engine' | 'generator' | 'tanks';
export interface SystemReading {
    tab: SystemTab;
    label: string;
    sub: string | null;
}
export declare const SYSTEM_TABS: readonly SystemTab[];
export declare const SYSTEM_TAB_NAMES: Record<SystemTab, string>;
export declare function describePath(path: string): SystemReading | null;
export declare function systemValue(path: string, value: number | string): string;
export declare const CORE_SERIES_PATHS: readonly ["environment.wind.speedTrue", "environment.outside.pressure"];
export type CoreSeriesPath = (typeof CORE_SERIES_PATHS)[number];
export interface CoreSeries {
    field: MetricField;
    scale: (n: number) => number;
    unit: string;
}
export declare const CORE_SERIES: Record<CoreSeriesPath, CoreSeries>;
export declare function isCoreSeriesPath(path: string): path is CoreSeriesPath;
export declare function coreSeriesFor(path: string): CoreSeries | undefined;
export declare function systemNumeric(path: string, value: number): {
    value: number;
    unit: string;
};
export declare function unitFor(path: string): string;