diff --git a/cmd/server/routes.go b/cmd/server/routes.go
index 95586c1b..6e30605b 100644
--- a/cmd/server/routes.go
+++ b/cmd/server/routes.go
@@ -2909,6 +2909,8 @@ var iataCoords = map[string]IataCoord{
 	"LAX": {Lat: 33.9425, Lon: -118.4081},
 	"SAN": {Lat: 32.7338, Lon: -117.1933},
 	"SMF": {Lat: 38.6954, Lon: -121.5908},
+	"APC": {Lat: 38.2132, Lon: -122.2807}, // Napa County
+	"STS": {Lat: 38.509, Lon: -122.8128},  // Charles M. Schulz–Sonoma County
 	"MRY": {Lat: 36.587, Lon: -121.843},
 	"EUG": {Lat: 44.1246, Lon: -123.2119},
 	"RDD": {Lat: 40.509, Lon: -122.2934},
diff --git a/cmd/server/routes_test.go b/cmd/server/routes_test.go
index 3f33b244..3765ae0f 100644
--- a/cmd/server/routes_test.go
+++ b/cmd/server/routes_test.go
@@ -1874,6 +1874,29 @@ func TestConfigRegionsWithCustomRegions(t *testing.T) {
 	}
 }
 
+func TestIataCoordsIncludesNapaAndSonoma(t *testing.T) {
+	// Issue #1786: observers tagged APC (Napa County) or STS (Charles M.
+	// Schulz–Sonoma County) rendered without lat/lon and did not pin on the map
+	// because iataCoords lacked entries for them.
+	cases := []struct {
+		code     string
+		lat, lon float64
+	}{
+		{"APC", 38.2132, -122.2807},
+		{"STS", 38.509, -122.8128},
+	}
+	for _, c := range cases {
+		coord, ok := iataCoords[c.code]
+		if !ok {
+			t.Errorf("iataCoords missing %q", c.code)
+			continue
+		}
+		if coord.Lat != c.lat || coord.Lon != c.lon {
+			t.Errorf("%s = {%v, %v}, want {%v, %v}", c.code, coord.Lat, coord.Lon, c.lat, c.lon)
+		}
+	}
+}
+
 func TestConfigMapWithCustomDefaults(t *testing.T) {
 	db := setupTestDB(t)
 	seedTestData(t, db)