--- /usr/share/octave/packages/mapping-1.4.2/degrees2dm.m	2022-02-23 20:02:09.000000000 -0500
+++ degrees2dm.m	2022-04-14 14:50:39.883803801 -0400
@@ -87,7 +87,9 @@
     ## leads to some precision errors.
 
     ## remove sign from any minute where its degree part is non-zero
-    nnzd = logical (dm(:,1));
+    nn = ~isnan (dm(:,1));
+    nnzd = false (rows (dm), 1);
+    nnzd(nn) = logical (dm(nn,1));
     dm(nnzd, 2) = abs (dm(nnzd, 2));
   endif