diff --git a/docs/annotated_words.ods b/docs/annotated_words.ods
index 483f47d..5dfa053 100644
Binary files a/docs/annotated_words.ods and b/docs/annotated_words.ods differ
diff --git a/justfile b/justfile
index 768550b..e6e599d 100644
--- a/justfile
+++ b/justfile
@@ -1,9 +1,13 @@
 build: fmt build-rust build-wasm build-js
 
-all: clean build # build-docs
+all: clean fmt test-rust build # build-docs
     rsync -ha ./web-frontend/build/ build/
     du -shc build/* | sort -h
 
+test-rust:
+    cargo test --all
+    cargo fmt --all --check
+
 build-rust:
     cargo build --all
 
@@ -28,10 +32,13 @@ watch-js:
 
 fmt:
     # just --fmt --unstable
-    cargo fmt
+    cargo fmt --all
     yarn --cwd ./web-frontend/ format
 
-init:
+serve:
+    http-server --verbose ./web-frontend/build/
+
+init-verbose:
     yarn --cwd ./web-frontend/
     cargo fetch
     cargo install wasm-pack
diff --git a/src/lib.rs b/src/lib.rs
index 13bdc6c..9e44503 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -200,7 +200,6 @@ impl Address<'_> {
     }
 
     /// Get the address as a latitude and longitude `f64` value
-    // TODO: Test this
     #[must_use]
     pub fn as_lat_lon(&self) -> (f64, f64) {
         let lat_lng = LatLng::from(self.as_cellid());
diff --git a/tests/algorithm.rs b/tests/algorithm.rs
index b0785ca..a49eabd 100644
--- a/tests/algorithm.rs
+++ b/tests/algorithm.rs
@@ -1,9 +1,12 @@
 use common::test_events;
 use s2::cellid::CellID;
+use std::cmp;
 use this_algorithm::Error;
 use this_algorithm::{Address, CELLID_LEVEL};
 #[macro_use]
 mod common;
+use common::approx_geodetic_difference_m;
+use common::ALLOWED_DISTANCE_ERROR_M;
 use common::CELLID_LEVEL_23_BITMASK;
 use common::CELLID_LEVEL_23_END_BIT;
 
@@ -19,14 +22,64 @@ fn test_invalid_lat_lon() {
     );
 }
 
+#[test]
+fn test_decoding_lat_lon() {
+    let mut max = f64::MIN;
+    let mut min = f64::MAX;
+    for (idx, entry) in test_events().iter().enumerate() {
+        eprintln!("Testing row {idx}");
+
+        let addr = Address::from_lat_lon(entry.lat, entry.lon).unwrap();
+        let addr_latlon = addr.as_lat_lon();
+
+        let (lat_diff, lon_diff) = (
+            (entry.lat - addr_latlon.0).abs(),
+            (entry.lon - addr_latlon.1).abs(),
+        );
+
+        min = if lat_diff < min {
+            lat_diff
+        } else if lon_diff < min {
+            lon_diff
+        } else {
+            min
+        };
+
+        max = if lat_diff > max && lat_diff < 1_f64 {
+            lat_diff
+        } else if lon_diff > max && lon_diff < 1_f64 {
+            lon_diff
+        } else {
+            max
+        };
+
+        if lat_diff > 0.01_f64 || lon_diff > 0.01_f64 {
+            eprintln!(
+                "Uh oh: {lat_diff}, {lon_diff}, ({}, {}) => ({:?}) => ({:?})",
+                entry.lat, entry.lon, addr, addr_latlon
+            );
+        }
+
+        // Ensure the distance is not more than the allowed distance
+        assert!(
+            approx_geodetic_difference_m(addr_latlon, (entry.lat, entry.lon))
+                < ALLOWED_DISTANCE_ERROR_M
+        );
+
+        // assert_eq!((entry.lat, entry.lon), (latlon.0, latlon.1));
+    }
+    eprintln!("Got max: {max} and min: {min}");
+    assert!(false);
+}
+
 #[test]
 fn test_cellid_translation() {
     for (idx, entry) in test_events().iter().enumerate() {
+        eprintln!("Testing row {idx}");
+
         let addr = Address::from_lat_lon(entry.lat, entry.lon).unwrap();
         let addr_cellid = addr.as_cellid();
 
-        eprintln!("Testing word {idx}");
-
         eprintln!(
             "Entry: ({},{}) => {:0>64b}",
             entry.lat, entry.lon, entry.cellid
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index ab7bdf2..c65a57a 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -4,6 +4,23 @@ use std::fs::File;
 use csv::ReaderBuilder;
 use serde::{Deserialize, Serialize};
 
+/// The allowed error for encoding and decoding points, in meters
+///
+/// Due to the selected S2 level being 23, our error is expected to be under 2 meters
+pub const ALLOWED_DISTANCE_ERROR_M: f64 = 0.0_f64;
+// The earth's approximate latitude circumfrence
+pub const EARTH_CIRCUMFERENCE_LAT: f64 = 0.0_f64;
+// The earth's approximate longitude circumfrence
+pub const EARTH_CIRCUMFERENCE_LON: f64 = 0.0_f64;
+
+/// Bitmask to preserve all data bits at level 23
+pub const CELLID_LEVEL_23_BITMASK: u64 =
+    0b11111111_11111111_11111111_11111111_11111111_11111111_10000000_00000000;
+
+/// The single 1 bit at the end of level 23
+pub const CELLID_LEVEL_23_END_BIT: u64 =
+    0b00000000_00000000_00000000_00000000_00000000_00000000_01000000_00000000;
+
 #[macro_export]
 macro_rules! assert_eq_u64 {
     ($a:expr, $b:expr) => {{
@@ -43,10 +60,7 @@ pub struct TestEntry {
     pub cellid: u64,
 }
 
-/// Bitmask to preserve all data bits at level 23
-pub const CELLID_LEVEL_23_BITMASK: u64 =
-    0b11111111_11111111_11111111_11111111_11111111_11111111_10000000_00000000;
-
-/// The single 1 bit at the end of level 23
-pub const CELLID_LEVEL_23_END_BIT: u64 =
-    0b00000000_00000000_00000000_00000000_00000000_00000000_01000000_00000000;
+/// Gets the approximate geodetic difference in meters between two latlons
+pub fn approx_geodetic_difference_m((lat1, lon1): (f64, f64), (lat2, lon2): (f64, f64)) -> f64 {
+    1000.0_f64
+}