diff --git a/matlab/GetJK.m b/matlab/GetJK.m
index fc91ae959189b78dcddfe8c3bc49b32d6f716dfb..e05008449d8b6e66d3fba0b40a67661c0c69783f 100644
--- a/matlab/GetJK.m
+++ b/matlab/GetJK.m
@@ -1,6 +1,6 @@
 function [J,K] = GetJK(Lat,Lon)
 
-global mstruct LOv LAv jg kg
+global LOv LAv jg kg
 
 X1 = -2600000;
 Y1 = 0;
@@ -8,11 +8,6 @@ X2 = 2300000;
 Y2 = 3200000;
 nx = 4901;
 ny = 3201;
-if length(which('projfwd')) > 0
-	[X,Y] = projfwd(mstruct,double(Lat),double(Lon));
-	J = (ny - 1)*(Y - Y1)/(Y2 - Y1) + 1;
-	K = (nx - 1)*(X - X1)/(X2 - X1) + 1;
-else
-	J = interp2(LOv,LAv,jg,Lon,Lat,'linear');
-	K = interp2(LOv,LAv,kg,Lon,Lat,'linear');
-end
+
+J = interp2(LOv,LAv,jg,Lon,Lat,'linear');
+K = interp2(LOv,LAv,kg,Lon,Lat,'linear');