diff --git a/docs/api/checkGr.js.html b/docs/api/checkGr.js.html
index fa8c6d4..66adcdb 100644
--- a/docs/api/checkGr.js.html
+++ b/docs/api/checkGr.js.html
@@ -124,7 +124,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/getCentroid.js.html b/docs/api/getCentroid.js.html
index b243323..bc9ae2a 100644
--- a/docs/api/getCentroid.js.html
+++ b/docs/api/getCentroid.js.html
@@ -114,7 +114,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/getGjson.js.html b/docs/api/getGjson.js.html
index e013f77..dc71298 100644
--- a/docs/api/getGjson.js.html
+++ b/docs/api/getGjson.js.html
@@ -155,7 +155,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/getGrFromCoords.js.html b/docs/api/getGrFromCoords.js.html
index 0e8a5a8..1e83740 100644
--- a/docs/api/getGrFromCoords.js.html
+++ b/docs/api/getGrFromCoords.js.html
@@ -176,7 +176,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/getLowerResGrs.js.html b/docs/api/getLowerResGrs.js.html
index 23438be..b3e6d20 100644
--- a/docs/api/getLowerResGrs.js.html
+++ b/docs/api/getLowerResGrs.js.html
@@ -106,7 +106,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/index.html b/docs/api/index.html
index 9047ba4..449f559 100644
--- a/docs/api/index.html
+++ b/docs/api/index.html
@@ -81,7 +81,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/km100.js.html b/docs/api/km100.js.html
index 3d29228..3953d90 100644
--- a/docs/api/km100.js.html
+++ b/docs/api/km100.js.html
@@ -578,7 +578,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_checkGr.html b/docs/api/module-src_checkGr.html
index 9d261c6..725c49f 100644
--- a/docs/api/module-src_checkGr.html
+++ b/docs/api/module-src_checkGr.html
@@ -242,7 +242,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_getCentroid.html b/docs/api/module-src_getCentroid.html
index 9154cdd..2b03f43 100644
--- a/docs/api/module-src_getCentroid.html
+++ b/docs/api/module-src_getCentroid.html
@@ -265,7 +265,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_getGjson.html b/docs/api/module-src_getGjson.html
index 6bb2e8a..d494d74 100644
--- a/docs/api/module-src_getGjson.html
+++ b/docs/api/module-src_getGjson.html
@@ -317,7 +317,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_getGrFromCoords.html b/docs/api/module-src_getGrFromCoords.html
index 2379e2c..c56d044 100644
--- a/docs/api/module-src_getGrFromCoords.html
+++ b/docs/api/module-src_getGrFromCoords.html
@@ -336,7 +336,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_getLowerResGrs.html b/docs/api/module-src_getLowerResGrs.html
index 43152e5..8d4009f 100644
--- a/docs/api/module-src_getLowerResGrs.html
+++ b/docs/api/module-src_getLowerResGrs.html
@@ -243,7 +243,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_km100.html b/docs/api/module-src_km100.html
index 80c9a81..1734250 100644
--- a/docs/api/module-src_km100.html
+++ b/docs/api/module-src_km100.html
@@ -259,7 +259,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_pntToArea.html b/docs/api/module-src_pntToArea.html
index 49344dd..8194d32 100644
--- a/docs/api/module-src_pntToArea.html
+++ b/docs/api/module-src_pntToArea.html
@@ -269,7 +269,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_projections.html b/docs/api/module-src_projections.html
index 1594911..d4f8701 100644
--- a/docs/api/module-src_projections.html
+++ b/docs/api/module-src_projections.html
@@ -170,7 +170,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_quadrants.html b/docs/api/module-src_quadrants.html
index 377cd20..6feed25 100644
--- a/docs/api/module-src_quadrants.html
+++ b/docs/api/module-src_quadrants.html
@@ -166,7 +166,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/module-src_tetrads.html b/docs/api/module-src_tetrads.html
index 54a000a..ea4fa46 100644
--- a/docs/api/module-src_tetrads.html
+++ b/docs/api/module-src_tetrads.html
@@ -166,7 +166,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/pntToArea.js.html b/docs/api/pntToArea.js.html
index 1730065..fa6936d 100644
--- a/docs/api/pntToArea.js.html
+++ b/docs/api/pntToArea.js.html
@@ -68,7 +68,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/projections.js.html b/docs/api/projections.js.html
index d30b457..48cdd90 100644
--- a/docs/api/projections.js.html
+++ b/docs/api/projections.js.html
@@ -74,7 +74,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/quadrants.js.html b/docs/api/quadrants.js.html
index 7bc4ebd..f22ccdf 100644
--- a/docs/api/quadrants.js.html
+++ b/docs/api/quadrants.js.html
@@ -66,7 +66,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/docs/api/tetrads.js.html b/docs/api/tetrads.js.html
index 2076807..a4bb9fd 100644
--- a/docs/api/tetrads.js.html
+++ b/docs/api/tetrads.js.html
@@ -150,7 +150,7 @@ <h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-sr
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:14:32 GMT+0000 (Greenwich Mean Time)
+    Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 4.0.4</a> on Tue Nov 12 2024 16:24:09 GMT+0000 (Greenwich Mean Time)
 </footer>
 
 <script> prettyPrint(); </script>
diff --git a/package.json b/package.json
index 13183b8..7c3edc6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "brc-atlas-bigr",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "description": "Utility functions for dealing with grid reference systems used in the British Isles.",
   "keywords": [
     "bng",