diff --git a/crates/engine/src/units.rs b/crates/engine/src/units.rs
index 236ec5af..ce0d55e7 100644
--- a/crates/engine/src/units.rs
+++ b/crates/engine/src/units.rs
@@ -302,6 +302,9 @@ fn bearing(t: &str) -> Option<f64> {
         None => (rest.strip_suffix('w')?, false),
     };
     let a = parse_dms(ang_s.trim())?;
+    if !(0.0..=90.0).contains(&a) {
+        return None;
+    }
     let deg = match (north, east) {
         (true, true) => 90.0 - a,
         (true, false) => 90.0 + a,
diff --git a/crates/engine/tests/units_bearing.rs b/crates/engine/tests/units_bearing.rs
new file mode 100644
index 00000000..010a5a42
--- /dev/null
+++ b/crates/engine/tests/units_bearing.rs
@@ -0,0 +1,11 @@
+use cadcraft_engine::units::parse_angle;
+
+#[test]
+fn bearing_rejects_out_of_range_angles() {
+    for s in ["n100e", "n-45e", "n91e", "s-1w", "n-0.5e"] {
+        assert_eq!(parse_angle(s), None, "{s}");
+    }
+    for s in ["n0e", "n90e", "s45w"] {
+        assert!(parse_angle(s).is_some(), "{s}");
+    }
+}