This Garmin Quatix 7X Solar Edition watch is $598 at Amazon, which is its best-ever price. Shipping is free, too. Battery life reaches up to 37 days in smartwatch mode and up to 89 hours in GPS mode when solar charging is factored in. The watch also connects to compatible Garmin chartplotters, letting boaters control autopilot and chart zoom directly from the wrist. Buy Now at Amazon