etrex 30 is best for mapping, battery life and hr/bike stuff; My 510 provides a bread crumb route which is really only good for approx 200km wouldnt use it for 300km the battery will be dead by then with the etrex you can just fit normal AA batterys no need to carry extra battery packs
etrex 30 is best for mapping, battery life and hr/bike stuff; My 510 provides a bread crumb route which is really only good for approx 200km wouldnt use it for 300km the battery will be dead by then with the etrex you can just fit normal AA batterys no need to carry extra battery packs