diff --git a/QnetGateway.cpp b/QnetGateway.cpp
index ec5a764..22a631a 100644
--- a/QnetGateway.cpp
+++ b/QnetGateway.cpp
@@ -996,9 +996,6 @@ void CQnetGateway::ProcessIncomingSD(const SDSVT &dsvt)
 		if (sd.size > 5) {
 			printf("got a size of %d\n", sd.size);
 			sd.size = 5;
-		} else if (sd.size < 0) {
-			printf("got a size of %d\n", sd.size);
-			sd.size = 0;
 		}
 		int size = sd.size;
 		if (size > 2)
@@ -1071,6 +1068,10 @@ void CQnetGateway::ProcessIncomingSD(const SDSVT &dsvt)
 					sd.ig = 0;
 				} else {
 					sd.ig += sd.size;
+					sd.gps[sd.ig] = 0;
+					for (int j=0; sd.gps[j]; j++)
+						printf("%c", sd.gps[j]);
+					printf("\n");
 				}
 				break;
 			case 0x40U:	// message
diff --git a/QnetGateway.h b/QnetGateway.h
index 161d7e1..829967a 100644
--- a/QnetGateway.h
+++ b/QnetGateway.h
@@ -81,12 +81,12 @@ using SBANDTXT = struct band_txt_tag {
 
 using SSD = struct sd_tag {
 	unsigned char header[41];
-	char message[21];
-	char gps[256];
-	int ih, im, ig;
+	unsigned char message[21];
+	unsigned char gps[256];
+	unsigned int ih, im, ig;
 	unsigned char type;
 	bool first;
-	int size;
+	unsigned int size;
 	void Init() { ih = im = ig = 0; first = true; }
 };