diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/AgpsHandler.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/AgpsHandler.java
index 958b101ac..c3b462611 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/AgpsHandler.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/AgpsHandler.java
@@ -82,6 +82,11 @@ public class AgpsHandler {
                         reportError(request.getUrl());
                         return null;
                     }
+                } else if (request.getPath().startsWith(("/ephemeris/cpe/sony"))) {
+                    if (!garminAgpsFile.isValidSonyCpe()) {
+                        reportError(request.getUrl());
+                        return null;
+                    }
                 } else {
                     LOG.warn("Refusing to send agps for unknown url");
                     return null;
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/GarminAgpsFile.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/GarminAgpsFile.java
index 48a8a5291..673060f18 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/GarminAgpsFile.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/garmin/agps/GarminAgpsFile.java
@@ -19,6 +19,7 @@ public class GarminAgpsFile {
 
     public static final byte[] GZ_HEADER = new byte[]{(byte) 0x1f, (byte) 0x8b};
     public static final byte[] CPE_RXNETWORKS_HEADER = new byte[]{(byte) 0x01, (byte) 0x00, (byte) 0x66};
+    public static final byte[] CPE_SONY_HEADER = new byte[]{(byte) 0x2a, (byte) 0x12, (byte) 0xa0, (byte) 0x02};
 
     public GarminAgpsFile(final byte[] bytes) {
         this.bytes = bytes;
@@ -66,6 +67,10 @@ public class GarminAgpsFile {
         return false;
     }
 
+    public boolean isValidSonyCpe() {
+        return ArrayUtils.startsWith(bytes, CPE_SONY_HEADER);
+    }
+
     public byte[] getBytes() {
         return bytes.clone();
     }