Forgot to commit in the new interfaces :(

lib/Treffynnon/Navigator/Coordinate/ParserInterface.php

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+<?php
+
+/**
+ * Navigator: a geographic calculation library for PHP
+ * @link http://navigator.simonholywell.com
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD 2-Clause License 
+ * @copyright 2012, Simon Holywell
+ * @author Simon Holywell <treffynnon@php.net>
+ */
+
+namespace Treffynnon\Navigator\Coordinate;
+
+use Treffynnon\Navigator as N;
+use Treffynnon\Navigator\Exception as E;
+
+/**
+ * A base set of methods to set a direction (N,S,E,W) and validate
+ * coordinates for classes that extend this abstract
+ */
+interface ParserInterface {
+
+    /**
+     * Initialise parser. Pass in either Treffynnon\Navigator::Long or Treffynnon\Navigator::Lat
+     * @param string $direction
+     */
+    public function __construct($direction = null);
+
+    /**
+     * Get the direction string
+     * @return string
+     */
+    public function getDirection();
+
+    /**
+     * Set the direction using Treffynnon\Navigator::Long or Treffynnon\Navigator::Lat
+     * @param string $direction
+     */
+    public function setDirection($direction);
+
+    /**
+     * Wrapper function around the parse method to allow for coordinate 
+     * validation
+     * @param float|string $coord
+     * @return float
+     * @throws \Exception 
+     */
+    public function set($coord);
+
+    public function parse($coord);
+
+    public function get($coord);
+}

lib/Treffynnon/Navigator/Distance/Calculator/CalculatorInterface.php

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+<?php
+
+/**
+ * Navigator: a geographic calculation library for PHP
+ * @link http://navigator.simonholywell.com
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD 2-Clause License 
+ * @copyright 2012, Simon Holywell
+ * @author Simon Holywell <treffynnon@php.net>
+ */
+
+namespace Treffynnon\Navigator\Distance\Calculator;
+
+use Treffynnon\Navigator as N;
+use Treffynnon\Navigator\CelestialBody as CB;
+
+/**
+ * A base set of methods to implement the setting of a celestial body
+ * for a calculator
+ */
+interface CalculatorInterface {
+
+    /**
+     * Calculate the distance between two coordinates
+     * @return float Distance in metres
+     */
+    public function calculate(N\LatLong $point1, N\LatLong $point2);
+
+    public function __construct(CB\CelestialBodyAbstract $body = null);
+
+    public function setCelestialBody(CB\CelestialBodyAbstract $body);
+
+    public function getCelestialBody();
+
+}

lib/Treffynnon/Navigator/Distance/Converter/ConverterInterface.php

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+<?php
+
+/**
+ * Navigator: a geographic calculation library for PHP
+ * @link http://navigator.simonholywell.com
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD 2-Clause License 
+ * @copyright 2012, Simon Holywell
+ * @author Simon Holywell <treffynnon@php.net>
+ */
+
+namespace Treffynnon\Navigator\Distance\Converter;
+
+/**
+ * A couple of alias functions for a shorter syntax when using the
+ * converter objects that extend this abstract
+ */
+interface ConverterInterface {
+
+    /**
+     * Convert the supplied value using factor
+     * @param float Value to be converted
+     * @return mixed Converted value 
+     */
+    public function convert($distance);
+
+    /**
+     * Convert the supplied value by reversing the factor
+     * @param float Value to be reverse converted
+     * @return mixed Reversed value 
+     */
+    public function reverse($distance);
+
+    /**
+     * Convert the distance
+     * @param float $distance
+     * @return float 
+     */
+    public function c($distance);
+
+    /**
+     * Reverse the distance conversion
+     * @param float $distance
+     * @return float 
+     */
+    public function r($distance);
+
+}