• As any good rowing coach knows, a working megaphone can be hard to find. Believing it needn’t be that way, rowing electronics manufacturer Nielsen-Kellerman developed the Blue Ocean Rugged Megaphone. Claiming to be the world’s toughest megaphone, the Blue Ocean is built to defy water damage, sinking, corrosion, cracking and splitting. It can also be used for up to a full day on a single charge – or you can bring an extra rechargeable battery for peace of mind. Handily, the battery and optional microphone are both compatible with the NK CoxBox. nksports.com