Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[0.3.0] - 2026-02-10

Longitude normalization now handles arbitrary wraps (e.g. 1080.0, -560.0) using modular arithmetic instead of single-wrap
Extended precision encoding formula fixed — was producing "00" for the first base 10 pair due to off-by-one in divisor calculation
Extended precision decoding — decode/1 now parses characters beyond position 6 and returns progressively smaller width/height
distance_between/2 normalizes both refs to 6-char subsquare level for consistent adjacency detection with mixed-precision inputs
Odd precision values (7, 9, etc.) now raise FunctionClauseError instead of being silently accepted
Removed stale excoveralls entry from mix.lock

from_base18/from_base24 replaced with O(1) byte arithmetic instead of Enum.find_index

Gridsquare.distance_between/2 function for calculating distance and bearing between two grid squares
Returns distance in kilometers and miles, plus bearing in degrees
Supports adjacent grid squares (east-west, north-south, diagonal) with optimized calculations
Uses Haversine formula for non-adjacent grid squares

Fixed ExDoc warning about missing LICENSE file in documentation generation
Removed LICENSE from docs extras list in mix.exs
Updated LICENSE link in README.md to point to GitHub repository instead of relative path

Initial release
Gridsquare.encode/2 and Gridsquare.encode/3 functions for encoding latitude/longitude to Maidenhead grid references
Gridsquare.decode/1 function for decoding grid references to coordinates
Gridsquare.new/1 function for creating GridSquare structs
Support for extended precision (6-20 characters)
Comprehensive documentation and examples
Test coverage for all functions