Don't leave home without an Epirb or PLB   

You can hire one from the Nelson Area Locator Beacon Trust.  Local Blenheim contact is   Paul Rennie   64 Park Tce Blenheim  Phone: 03 578 5311 ...  or you can hire from Nelson suppliers

Suppliers and Hire costs on their website http://www.nelsonarealocatorbeacontrust.org.nz