altoslib: When GPS disappears, set range and elevation to MISSING

Use MISSING instead of bogus values so that displayers can tell what
to do.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/altoslib/AltosState.java b/altoslib/AltosState.java
index d391dcfb..b05cd358 100644
--- a/altoslib/AltosState.java
+++ b/altoslib/AltosState.java
@@ -910,8 +910,8 @@ public class AltosState implements Cloneable {
 	}
 
 	void update_gps() {
-		elevation = 0;
-		range = -1;
+		elevation = AltosLib.MISSING;
+		range = AltosLib.MISSING;
 
 		if (gps == null)
 			return;