GOOD LUCK!
WITHIN THE LAST YEAR I FACED THE SAME PROBLEM. I ENDED UP SELLING THE NEW RAYMARINE ON EBAY AND BUYING A SIMRAD WP32 (WHICH I LIKE. IT WAS ABOUT $800, EASY TO INSTALL AND WORKS OK).CHECK THE ARCHIVES ON THIS SITE. "BAD OBSESSION" SUCCESSFULLY INSTALLED THE S1 IN HIS MKII. HE HAD TO CUT A FAIR AMOUNT OF FIBERGLASS IF I REMEMBER CORRECTLY. SOMETHING I DIDN'T WANT TO DO. IF I HAD BOUGHT THE RAYMARINE S1 FROM SOMEONE WITH A RETURN POLICY I WOULD HAVE SAVED A LOT OF MONEY.GOOD LUCK.