fix error in GPS whisker

standard.tex

@@ -318,13 +318,13 @@ The GPS whisker is used to encode latitude, longitude, altitude, precision, head
   \hline
   6 & 4 & & Longitude (signed integer, ${2^{31} \over 180 \degree}x$) \\
   \hline
-  7 & 2 & & Altitude (16-bit float, meters) \\
+  10 & 2 & & Altitude (16-bit float, meters) \\
   \hline
-  9 & 1 & & Maximum location error (unsigned integer, meters) \\
+  12 & 1 & & Maximum location error (unsigned integer, meters) \\
   \hline
-  10 & 1 & & Heading (unsigned integer, radians$* {128\over{\pi}}$). Clockwise relative to north \\
+  13 & 1 & & Heading (unsigned integer, radians$* {128\over{\pi}}$). Clockwise relative to north \\
   \hline
-  11 & 2 & & Speed (16-bit float, meters per second) \\
+  14 & 2 & & Speed (16-bit float, meters per second) \\
   \hline
 \end{tabularx}
 }