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Geoff Aaron puts the new Casio watch through its paces during one of his weekly training sessions.


The new Casio MASTER OF G MUDMASTER didn’t just survive Geoff Aaron’s training session environment, it thrived in it.

Thanks to the ingenuity of a Casio engineer who designed a watch over 30 years ago that would resist centrifugal and impact forces as well as high water pressure...and now mud with, Mud Resist construction the MASTER OF G GG1000-1A5 is made for the off-road environment.

Water. Not a problem. The GG1000-1A5 is water-resistant to 200m.Casio
Technical trails. This watch is made for that environment.Casio
Which way is north? Your watch can tell you that.Casio
Mud in the buttons? Never. With Mud Resist construction, o-rings keep the mud out, offer added impact protection and ensure smooth operation.Casio
Shock-resistant. From this height? It’s safe to say more so than man and machine.Casio
Time to ride!Casio


  • Shock-resistant
  • Mud-resistant buttons use cylinder type guard structure with gaskets for shafts and cylinders to prevent mud and dust from getting into the watch
  • 200m water-resistant
  • Digital compass measures and displays direction as one of 16 points
  • Measuring range: 0 to 359 degrees
  • Measuring unit: 1 degree 20 seconds continuous measurement
  • Hand indication of North
  • Bidirectional calibration
  • Magnetic declination correction
  • Bearing memory
  • Thermometer display range: -10 to 60 C (14 to 140 F) Display unit: 0.1 C (0.2 F)
  • LED backlight (Auto LED Super Illuminator Backlight, selectable illumination duration, afterglow)