You define the projection by defining functions: myProjection.fromLatLngToPoint(); myProjection.fromPointToLatLng();
So the answer to both questions is: Yes. Just write the functions to work that way. However your second question raises questions: - is a 10,000m wide area a "local area"? - can you make UTM work over such a wide area with acceptable accuracy? -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. To unsubscribe from this group, send email to google-maps-js-api-v3+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.