Casio
G-Shock Mudmaster GG-B100XM
GG-B100X with a stainless steel front bezel
The GG-B100XM has the GG-B100X's functions, including Bluetooth, a step counter and the location indicator set from the phone app, with a stainless steel front bezel instead of carbon fibre. At 104 g it is heavier than the GG-B100X.
Key specifications
- Overall score
- 5.3 out of 10,Mid-rangeHow we score
- Case size
- length 55.4 mm, width 51.3 mm, height 19.4 mm
- Weight
- 104 g
- Water resistance depth
- 200 m
Full specification
Size and weight
- Case size
- length 55.4 mm, width 51.3 mm, height 19.4 mm
- Weight
- 104 g
Power and timekeeping
- Solar charging
- No
- Radio time sync (Multi-Band 6)
- No
Connections and navigation
- Bluetooth
- Yes
- Phone app features
- Auto time adjustment, location indicator, mission log, step count data transfer, auto altitude calibration, phone finder, about 300 world time cities
- Navigation to a set point
- Uses the phone's location
Sensors
- Digital compass
- Yes
- Altimeter and barometer
- Yes
- Thermometer
- Yes
- Step counter
- Yes
Build
- Analogue hands
- Yes
- Sapphire crystal
- No
- Vibration resistant (as listed by Casio)
- No
- Carbon Core Guard case
- Yes
- Water resistance depth
- 200 m
- Materials
- Carbon fibre-reinforced bio-based resin case, stainless steel front bezel, bio-based resin band
Variants
3 variants
GG-B100XM-1ABlack, steel bezel- UK model code
GG-B100XM-1AER- RRP
- £369
GG-B100XMB-1ABlack, black steel bezel- UK model code
GG-B100XMB-1AER- RRP
- £369
GG-B100XMH-5ABrown and gold- Edition
- Master of Horizon Gold series (2026)
- UK model code
GG-B100XMH-5AER- RRP
- £365
Alternatives
Chosen from the overall scores, recommended retail prices and sizes of the models on sale in the UK.
Cheaper
Within a point of its score, with a lower RRP
Casio
G-Shock Mudmaster GG-B100Overall score 5.5 out of 10, Mid-rangeRRP £349
£16 less (based on RRP), 0.2 points higher
Casio
G-Shock Mudmaster GG-B100XOverall score 5.5 out of 10, Mid-rangeRRP £349
£16 less (based on RRP), 0.2 points higher
Better specified
More than a point higher in overall score
Casio
G-Shock Mudmaster GWG-B1000Overall score 8.9 out of 10, Top of the rangeRRP from £699
3.6 points higher
Compare with
Each link opens the two side by side in the comparison.
Sources
Specifications last checked on .
Sources (11) Close
Casio manual 5744, Linking with a Phone (opens in a new tab)checked
Covers: Navigation to a set point.
Casio manual 5744, Specifications (opens in a new tab)checked
Covers: Solar charging, Radio time sync (Multi-Band 6), Bluetooth, Phone app features, Digital compass, Altimeter and barometer, Thermometer, Step counter, Analogue hands.
Casio UK, GG-B100XM-1A (opens in a new tab)checked
Covers: Status, Variants, Case size, Weight, UK availability, Variants sold in the UK, UK RRP.
Casio UK, GG-B100XMB-1A (opens in a new tab)checked
Covers: Variants, Variants sold in the UK, UK RRP.
Casio UK, GG-B100XMH-5A (opens in a new tab)checked
Covers: Variants, Variants sold in the UK, UK RRP.
F.Hinds, GG-B100XM-1AER (opens in a new tab)checked
Covers: Variants, Variants sold in the UK, UK RRP.
F.Hinds, GG-B100XMB-1AER (opens in a new tab)checked
Covers: Variants, Variants sold in the UK, UK RRP.
G-Central, August 2026 releases (opens in a new tab)checked
Covers: Variants.
G-Central, February 2026 releases (opens in a new tab)checked
Covers: Launch date, Variants.
G-Central, GG-B100X and GG-B100 compared (opens in a new tab)checked
Covers: Sapphire crystal, Vibration resistant (as listed by Casio), Carbon Core Guard case, Materials, Tagline.
John Lewis, GG-B100XMH-5AER (opens in a new tab)checked
Covers: Variants, Water resistance depth, Variants sold in the UK, UK RRP.