Divisions are two degrees (Long/Lat).
Here's a recent (2330Z Aug 30th) IR image of Ioke approaching Wake Island. That black dot, two squares down, two squares right from the top left is Wake.
Current observations on Wake (00:48Z Aug 31st) 43.15 knots per hour wind, 56.57 knots per hour gusts, 992.40 mbars pressure. No idea how long the weather station will last on Wake, wave heights are supposed to get to 50 feet, and the station is at 12 feet.