Can you tow a skier using a wide-angle rear-view mirror instead of an observer on board?

No, towing a skier using only a wide-angle rear-view mirror is not safe or compliant with boating regulations. An observer on board is necessary to ensure the safety of the skier by monitoring their well-being and signaling the driver. The mirror may provide some visibility, but it cannot replace the critical role of an attentive observer who can react quickly to any issues that arise. Always follow local laws and safety guidelines when towing skiers.