diff --git a/c/include/libsbp/navigation_macros.h b/c/include/libsbp/navigation_macros.h
index 73f964dc5e..616a817689 100644
--- a/c/include/libsbp/navigation_macros.h
+++ b/c/include/libsbp/navigation_macros.h
@@ -434,6 +434,7 @@
 #define SBP_POS_LLH_ACC_CONFIDENCE_LEVEL_3935 (1)
 #define SBP_POS_LLH_ACC_CONFIDENCE_LEVEL_6827 (2)
 #define SBP_POS_LLH_ACC_CONFIDENCE_LEVEL_9545 (3)
+#define SBP_POS_LLH_ACC_CONFIDENCE_LEVEL_9973 (4)
 #define SBP_POS_LLH_ACC_TYPE_OF_REPORTED_TOW_MASK (0x1u)
 #define SBP_POS_LLH_ACC_TYPE_OF_REPORTED_TOW_SHIFT (5u)
 #define SBP_POS_LLH_ACC_TYPE_OF_REPORTED_TOW_GET(flags)               \
diff --git a/docs/sbp.pdf b/docs/sbp.pdf
index 47472a84f6..0e7f412b78 100644
Binary files a/docs/sbp.pdf and b/docs/sbp.pdf differ
diff --git a/rust/sbp/src/messages/navigation.rs b/rust/sbp/src/messages/navigation.rs
index fd25afa204..c18cde1b03 100644
--- a/rust/sbp/src/messages/navigation.rs
+++ b/rust/sbp/src/messages/navigation.rs
@@ -4724,6 +4724,9 @@ pub mod msg_pos_llh_acc {
 
         /// 95.45%
         _9545 = 3,
+
+        /// 99.73%
+        _9973 = 4,
     }
 
     impl std::fmt::Display for ConfidenceLevel {
@@ -4732,6 +4735,7 @@ pub mod msg_pos_llh_acc {
                 ConfidenceLevel::_3935 => f.write_str("39.35%"),
                 ConfidenceLevel::_6827 => f.write_str("68.27%"),
                 ConfidenceLevel::_9545 => f.write_str("95.45%"),
+                ConfidenceLevel::_9973 => f.write_str("99.73%"),
             }
         }
     }
@@ -4743,6 +4747,7 @@ pub mod msg_pos_llh_acc {
                 1 => Ok(ConfidenceLevel::_3935),
                 2 => Ok(ConfidenceLevel::_6827),
                 3 => Ok(ConfidenceLevel::_9545),
+                4 => Ok(ConfidenceLevel::_9973),
                 i => Err(i),
             }
         }
diff --git a/spec/yaml/swiftnav/sbp/navigation.yaml b/spec/yaml/swiftnav/sbp/navigation.yaml
index b383b288db..c44ff2a193 100644
--- a/spec/yaml/swiftnav/sbp/navigation.yaml
+++ b/spec/yaml/swiftnav/sbp/navigation.yaml
@@ -743,6 +743,7 @@ definitions:
                                   - 1: 39.35%
                                   - 2: 68.27%
                                   - 3: 95.45%
+                                  - 4: 99.73%
               - n_sats:
                     type: u8
                     desc: Number of satellites used in solution.