Add flight route map; algorithm for picking from multiple nav points; some tests

app/Repositories/NavdataRepository.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Repositories;
+
+use App\Models\Navdata;
+use App\Repositories\Traits\CacheableRepository;
+use Prettus\Repository\Contracts\CacheableInterface;
+
+class NavdataRepository extends BaseRepository implements CacheableInterface
+{
+    use CacheableRepository;
+
+    // Super short lived cache for when the navdata stuff is re-imported
+    protected $cacheMinutes = 5;
+
+    public function model()
+    {
+        return Navdata::class;
+    }
+}