diff --git a/routes/aprs.py b/routes/aprs.py
index bce11fe..9083f88 100644
--- a/routes/aprs.py
+++ b/routes/aprs.py
@@ -48,6 +48,7 @@ APRS_FREQUENCIES = {
     'japan': '144.640',
     'china': '144.640',
     'iss': '145.825',
+    'sonate2': '145.825',
 }
 
 # Statistics
diff --git a/templates/index.html b/templates/index.html
index 897ca0f..946f183 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -1017,6 +1017,7 @@
                                     <option value="japan">Japan (144.640)</option>
                                     <option value="china">China (144.640)</option>
                                     <option value="iss">ISS (145.825)</option>
+                                    <option value="sonate2">SONATE-2 (145.825)</option>
                                     <option value="custom">Custom Frequency</option>
                                 </select>
                             </div>
diff --git a/templates/partials/modes/sstv-general.html b/templates/partials/modes/sstv-general.html
index 89b2ed5..99d4f82 100644
--- a/templates/partials/modes/sstv-general.html
+++ b/templates/partials/modes/sstv-general.html
@@ -44,6 +44,7 @@
                 </optgroup>
                 <optgroup label="2 m (VHF)">
                     <option value="145.625|fm">145.625 MHz FM - Simplex</option>
+                    <option value="145.880|fm">145.880 MHz FM - SONATE-2 (Martin M1)</option>
                 </optgroup>
                 <optgroup label="70 cm (UHF)">
                     <option value="433.775|fm">433.775 MHz FM - Simplex</option>