Javascript bookmarklet you can run when in google maps (on OS X) to look at the same location in Apple Maps (useful for transfer to iOS).

bookmarklet

javascript:var%20y%20=%20document.location.href;if%20(y.indexOf(%27google.com/maps/%27)%3E=0)%20{if(y.indexOf(%27/preview/search/%27)%3E=0){var%20query=y.indexOf(%27/preview/search/%27)+16;query=y.substring(query,y.length);var%20x=%27http://maps.apple.com/?q=%27+query;document.location=x;setTimeout(function()%20{document.location=y;},%20900);}else{var%20llDex=y.indexOf(%27/@%27)+2;var%20len=y.indexOf(%27/data%27);if(len==-1){len=y.length;}if((len%3E0)&&(llDex%3Clen)){var%20loc=y.substring(llDex,len);llDex=loc.lastIndexOf(",");len=loc.length-1;if((llDex%3E0)&&(llDex+1%3Clen)){var%20zoom=loc.substring(llDex+1,len);loc=loc.substring(0,llDex);var%20x=%27http://maps.apple.com/?ll=%27+loc+%27&z=%27+zoom;document.location=x;setTimeout(function()%20{document.location=y;},%20900);}}}}

gistfile1.js

javascript: 
var y = document.location.href;
if (y.indexOf('google.com/maps/') >= 0) {
	if (y.indexOf('/preview/search/') >= 0) {
		var query = y.indexOf('/preview/search/') + 16;
		query = y.substring(query, y.length);
		var x = 'http://maps.apple.com/?q=' + query;
		document.location = x;
		setTimeout(function() {
			document.location = y;
		}, 900);
	} else {
		var llDex = y.indexOf('/@') + 2;
		var len = y.indexOf('/data');
		if (len == -1) {
			len = y.length;
		}
		if ((len > 0) && (llDex < len)) {
			var loc = y.substring(llDex, len);
			llDex = loc.lastIndexOf(",");
			len = loc.length - 1;
			if ((llDex > 0) && (llDex + 1 < len)) {
				var zoom = loc.substring(llDex + 1, len);
				loc = loc.substring(0, llDex);
				var x = 'http://maps.apple.com/?ll=' + loc + '&z=' + zoom;
				document.location = x;
				setTimeout(function() {
					document.location = y;
				}, 900);
			}
		}
	}
}