diff --git a/location/api/current.txt b/location/api/current.txt
index c55676b..c7954fe 100644
--- a/location/api/current.txt
+++ b/location/api/current.txt
@@ -682,6 +682,7 @@
   public final class AltitudeConverter {
     ctor public AltitudeConverter();
     method @WorkerThread public void addMslAltitudeToLocation(@NonNull android.content.Context, @NonNull android.location.Location) throws java.io.IOException;
+    method @FlaggedApi(Flags.FLAG_GEOID_HEIGHTS_VIA_ALTITUDE_HAL) public boolean addMslAltitudeToLocation(@NonNull android.location.Location);
   }
 
 }
diff --git a/location/java/android/location/altitude/AltitudeConverter.java b/location/java/android/location/altitude/AltitudeConverter.java
index 6f88912..461dafb 100644
--- a/location/java/android/location/altitude/AltitudeConverter.java
+++ b/location/java/android/location/altitude/AltitudeConverter.java
@@ -16,12 +16,14 @@
 
 package android.location.altitude;
 
+import android.annotation.FlaggedApi;
 import android.annotation.NonNull;
 import android.annotation.WorkerThread;
 import android.content.Context;
 import android.frameworks.location.altitude.GetGeoidHeightRequest;
 import android.frameworks.location.altitude.GetGeoidHeightResponse;
 import android.location.Location;
+import android.location.flags.Flags;
 
 import com.android.internal.location.altitude.GeoidMap;
 import com.android.internal.location.altitude.S2CellIdUtils;
@@ -213,12 +215,12 @@
     }
 
     /**
-     * Same as {@link #addMslAltitudeToLocation(Context, Location)} except that data will not be
-     * loaded from raw assets. Returns true if a Mean Sea Level altitude is added to the
-     * {@code location}; otherwise, returns false and leaves the {@code location} unchanged.
-     *
-     * @hide
+     * Same as {@link #addMslAltitudeToLocation(Context, Location)} except that this method can be
+     * called on the main thread as data will not be loaded from raw assets. Returns true if a Mean
+     * Sea Level altitude is added to the {@code location}; otherwise, returns false and leaves the
+     * {@code location} unchanged.
      */
+    @FlaggedApi(Flags.FLAG_GEOID_HEIGHTS_VIA_ALTITUDE_HAL)
     public boolean addMslAltitudeToLocation(@NonNull Location location) {
         validate(location);
         MapParamsProto geoidHeightParams = GeoidMap.getGeoidHeightParams();
diff --git a/location/java/android/location/flags/location.aconfig b/location/java/android/location/flags/location.aconfig
index 32ad09c..a96fe47 100644
--- a/location/java/android/location/flags/location.aconfig
+++ b/location/java/android/location/flags/location.aconfig
@@ -8,6 +8,13 @@
 }
 
 flag {
+    name: "geoid_heights_via_altitude_hal"
+    namespace: "location"
+    description: "Flag for making geoid heights available via the Altitude HAL"
+    bug: "304375846"
+}
+
+flag {
     name: "gnss_api_navic_l1"
     namespace: "location"
     description: "Flag for GNSS API for NavIC L1"