* 1 knot = 1 nautical mile per hour

* 1 nautical mile = 1.1508 statute miles (or land miles)

Calculation:

1. Convert knots to nautical miles per hour: 489 knots = 489 nautical miles per hour

2. Convert nautical miles per hour to statute miles per hour: 489 nautical miles per hour * 1.1508 statute miles/nautical mile = 562.5 statute miles per hour

Therefore, 489 knots is approximately 562.5 miles per hour.