Print this page onto an OHP  transparency
and lay it over the Explorer 137map. 

Line up the marks to their relevant grid lines on the map.

You may have to adjust your browser page setup to fit the page to A4.

The original size of the image is 161mm wide by 280mm high.

The A4 page size is 210 mm wide by 297mm high.

You may try
using your browser save the image. Then  arranging it on your page using an art  package. 

Good luck 

I hope it works well for you.