/**
 * NMEA sentence parser for GPS data.
 *
 * Handles GPRMC sentence parsing with checksum validation and
 * coordinate conversion from degrees-minutes to decimal degrees.
 */
import type { GprmcData } from './types.js';
/**
 * Validate NMEA sentence XOR checksum.
 *
 * Computes XOR of all bytes between '$' and '*', then compares
 * with the stated 2-digit hex checksum after '*'.
 *
 * @param sentence - Complete NMEA sentence string including $ and *XX
 * @returns True if checksum is valid, False otherwise
 */
export declare function validateNmeaChecksum(sentence: string): boolean;
/**
 * Parse NMEA GPRMC sentence for GPS position and speed.
 *
 * Extracts latitude, longitude, and ground speed from a valid
 * GPRMC sentence. Only processes sentences with status 'A' (active fix).
 *
 * GPRMC format:
 * $GPRMC,HHMMSS.sss,S,DDMM.MMMM,N,DDDMM.MMMM,E,SPD,CRS,DDMMYY,,,M*HH
 *
 * @param sentence - GPRMC sentence string (comma-separated fields)
 * @returns GprmcData object with parsed values, or null if invalid or void status
 */
export declare function parseGprmcSentence(sentence: string): GprmcData | null;
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