altosui: Use preferred units for main deployment height configuration

Show and accept values in the preferred units; create a separate list
of preferred values for each set of units

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

1 files changed, 4 insertions, 0 deletions

diff --git a/altoslib/AltosConvert.java b/altoslib/AltosConvert.java
index a42b36c4..8cd478e2 100644
--- a/altoslib/AltosConvert.java
+++ b/altoslib/AltosConvert.java
@@ -242,6 +242,10 @@ public class AltosConvert {
 		return meters * (100 / (2.54 * 12));
 	}
 
+	public static double feet_to_meters(double feet) {
+		return feet * 12 * 2.54 / 100.0;
+	}
+
 	public static double meters_to_miles(double meters) {
 		return meters_to_feet(meters) / 5280;
 	}