Report fresh GNSS fixes independently of GGA quality

Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>

extras/hw_tests/gnss_receive/README.md

@@ -6,8 +6,11 @@ format-error, and parsed-sentence counts every two seconds. Unsupported sentence
 types count as valid frames but do not increase the parsed count.
 
 No receiver commands are sent. A position fix is reported when available and
-is not required to establish communication. Coordinates are printed only with
-a recent fix. Keep raw captures private if they contain location information.
+is not required to establish communication. `fix` is true only when the latest
+fix status is valid and less than five seconds old; coordinates use that same
+check, including for RMC/GLL-only output. `ggaQuality` reports the last GGA fix
+quality separately and may be stale when GGA sentences stop arriving. Keep raw
+captures private if they contain location information.
 
 | Fixture | Build selection | Receive wiring |
 | --- | --- | --- |

extras/hw_tests/gnss_receive/gnss_receive.ino

@@ -126,9 +126,12 @@ void reportGPS(Adafruit_GPS &gps, ReceiveCounts &counts,
   Serial.print(counts.formatErrors);
   Serial.print(F(" parsed="));
   Serial.print(counts.parsed);
+  bool freshFix = gps.fix && gps.secondsSinceFix() < 5;
   Serial.print(F(" fix="));
+  Serial.print(freshFix);
+  Serial.print(F(" ggaQuality="));
   Serial.print(gps.fixquality);
-  if (gps.fix && gps.fixquality && gps.secondsSinceFix() < 5) {
+  if (freshFix) {
     Serial.print(F(" latitudeE7="));
     Serial.print(gps.latitude_fixed);
     Serial.print(F(" longitudeE7="));