diff --git a/src/lib.rs b/src/lib.rs
index 65872a7..32b56fb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -291,6 +291,10 @@ pub struct Tpv {
     pub epc: Option<f32>,
     /// Horizontal 2D position error in meters.
     pub eph: Option<f32>,
+    /// Course over ground, degrees magnetic.
+    pub magtrack: Option<f32>,
+    /// Magnetic variation, degrees.
+    pub magvar: Option<f32>,
 }
 
 /// Detailed satellite information.