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1983年の誕生以来タフネスを追求し続けているG-SHOCKから、金属パーツによる強固な外装を搭載し、高い耐久性と装着性を実現したMaster of GMUDMASTER FLAGSHIPモデルです。Master of G(マスターオブG)は、G-SHOCKの中でも過酷な状況に耐え得るタフな機能を強化したラインです。その中でもMUDMASTERは、瓦礫や土砂が山積・散乱するようなハードな環境での使用を想定したタフネスウオッチとして、極限の環境下で活動するレンジャーやレスキュー隊から高い評価と信頼を獲得してきました。このGWG-B1000は、カーボンコアガード構造のケースで、高強度かつ耐久性に優れたカーボン繊維強化樹脂ケースと高精度の鍛造技術によるメタル素材を融合したモデルです。機能面では電波ソーラーに加えてトリプルセンサーを搭載し、方位、気圧・高度、温度情報を取得可能。ダブルLEDライト、サファイアガラス等により高い視認性と時刻判読性を確保しています。また、アプリで任意の地点を設定することで、3時位置のインジケーター針が常にその方向を指し示すロケーションインジケーター機能を搭載。砂嵐などで視界が阻まれた場合でも、ユーザーの行動をサポートします。ケースとベゼルの一部、バンドには、バイオマスプラスチックを採用し自然環境にも配慮しました。カーボンコアガード技術と高精度の鍛造技術によるメタル外装により機能性と装着性を高めたMUDMASTER の登場です。●耐衝撃構造 ●耐震動構造 ●防塵・防泥構造 ●タフソーラー(ソーラー充電システム) ●2 0気圧防水機能 ●電波受信機能:自動受信(最大6回/日)(中国電波は最大5回/日)/ 手動受信、<日本>受信電波:J J Y、周波数:40k H z /60k H z(福島/九州両局対応モデル) <北米地域>受信電波:W W V B、周波数:60k H z <ヨーロッパ地域>受信電波:M S F/ D C F77、周波数:60kHz / 77.5kHz <中国>受信電波:BPC、周波数:68.5kHz*ホームタイム設定を受信可能な都市に設定すると、都市に合わせた局を受信します。尚、時差は選択した都市またはタイムゾーンによって設定されます。●モバイルリンク機能(対応携帯電話とのB l u e t o o t h ® 通信による機能連動) ●針位置自動補正機能 ●針退避機能(手動、自動(高度、気圧、温度計測時)) ●方位計測機能:16方位・方位の角度(0 ~359°)を計測、方位連続計測(60秒)、北方位指針機能、ベアリングメモリー機能、自動水平補正機能、磁気偏角補正機能、方位補正機能 ●気圧計測機能(計測範囲:260 ~1,100hPa、1hPa 単位)、気圧傾向グラフ表示(過去20時間分を表示)、気圧差インジケーター(±10h P a)、気圧傾向インフォメーションアラーム(特徴的な気圧の変化が起こった場合に矢印と報音でお知らせします)※気圧傾向グラフは30分毎の計測に変更することができます。その際は過去5時間分です。 ●高度計測機能/ 相対高度計(計測範囲:-700 ~10,000m、1m 単位)、高度メモリー(計測年月日・時刻・高度を最大30本マニュアルメモリー)、自動記録データ(最高/ 最低高度、オート積算(上昇/ 下降)メモリー)、高度傾向グラフ、高度差インジケーター(±100m/±1000m)、計測間隔設定機能(5秒/2分毎)※最初の3分間のみ1秒毎 ●温度計測機能(計測範囲:-10~60℃、0.1℃単位) ●ワールドタイム:世界55都市(38タイムゾーン、サマータイム自動設定機能付き)+ UTC(協定世界時)の時刻表示、ホームタイムの都市入替機能、U TCダイレクト呼出機能 ●日の出・日の入時刻表示●ストップウオッチ(1/100秒、24時間計、スプリット付き) ●タイマー(セット単位:1分、最大セット:60分、1秒単位で計測) ●時刻アラーム5本・時報 ●バッテリーインジケーター表示 ●パワーセービング機能(暗所では一定時間が経過すると表示を消し運針を停止して節電します) ●フルオートカレンダー ●12 /24時間制表示切替 ●操作音ON/OFF 切替機能 ●ダブルLEDライト:文字板用L E D ライト(フルオートライト、残照機能、残照時間切替(1. 5秒/ 3秒)付き)、LCD部用LEDバックライト(フルオートライト、残照機能、残照時間切替(1.5秒/3秒)付き)● フル充電時からソーラー発電無しの状態での駆動時間機能使用の場合:約6ヵ月パワーセービング状態の場合:約24 ヵ月 Review: built G-Shock tough - Outstanding product Review: 最高です。 思った通りの時計がポイントもついて大満足です。














| ASIN | B0CJJ6JXYQ |
| ASIN | B0CJJ6JXYQ |
| Additional Features | World Time |
| Age Range Description | Adult |
| Amazon Bestseller | #47,911 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #343 in Men's Wrist Watches |
| Band Color | Khaki |
| Band Material Type | Resin |
| Band Width | 28.7 Millimeters |
| Batteries | 1 Lithium Ion batteries required. (included) |
| Brand Name | G-Shock |
| Case Diameter | 52.1 Millimeters |
| Case Material Type | Resin |
| Case Thickness | 16.2 Millimeters |
| Clasp Type | Tang Buckle |
| Closure Type | Buckle |
| Crystal | Sapphire Crystal |
| Customer Reviews | 4.4 4.4 out of 5 stars (163) |
| Date First Available | October 9, 2023 |
| Department | Men |
| Dial Color | Black |
| Display | Analog-Digital |
| Face Style | Military |
| Item Type Name | Casual Watch |
| Item Weight | 114 Grams |
| Item model number | GWG-B1000-3AJF |
| Manufacturer | CASIO(カシオ) |
| Manufacturer | CASIO(カシオ) |
| Manufacturer Part Number | GWG-B1000-3AJF |
| Model Name | Casio MUDMASTER Wristwatch, Radio Solar Biomass Plastic |
| Model Number | GWG-B1000-3AJF |
| Package Dimensions | 12 x 9.4 x 9.2 cm; 114 g |
| Power Source | Battery Powered |
| Release date | October 13, 2023 |
| Series Number | 1000 |
| Shape | Round |
| Style Name | Military |
| Theme | Military |
| Warranty Type | One year warranty |
| Watch Movement Type | Quartz |
A**O
built G-Shock tough
Outstanding product
A**ー
最高です。 思った通りの時計がポイントもついて大満足です。
H**S
フロッグマンから乗り換えです。 フロッグマンよりだいぶ短いベルトで、短めです。 手首が太い人にはきついかもしれません。
時**し
トリプルセンサー付き 細かい所までかっこいい 着けていてとても満足 思っていたより小顔ではなく丁度いい
北**義
ルックス最高、大満足。
D**ん
ブラックにしようかカーキーにしようか迷ってカーキーにしました。時計が届いて、腕につけたらカーキー最高に良かったです。大満足!!!
雪**ま
流石にマッドマスター⌚梱包も丁寧で配達もスムーズでした。即、使用出来て満足しています😊
M**A
デザインが良いので満足です。ただ、でかい。
T**Y
Based on owning one for over a year. In short: this watch is exceptional. If you’re into rugged, feature‑packed tool watches, it really delivers. But like any high‑end tough watch, it has trade‑offs. I’ll cover everything—what I love, what could be better, and whether it’s worth the price. What Makes It Amazing (What I Love) After a year of daily wear, especially outdoors, travel, and “real‑work” use, these are the highlights: Durability This thing really lives up to its rugged billing. Mud, rain, grit, dirt, occasional bumps—all no problem. The “Mud Resistance / Mudmaster” name is not just hype. The button guards, sealings, materials hold up. Even after rough use there’s minimal cosmetic wear (very, very light scratches here and there) and zero functional issues. Reliability / Power Solar charging works well. Even with mixed conditions (indoors some days, outdoors others), the battery remains in healthy levels. Also the Multi‑Band 6 atomic time sync keeps time dead‑on without needing constant manual adjustment. For a guy who travels or changes timezone occasionally, that’s a huge relief. Sensor Suite & Utility * Altimeter/barometer: I use these often when hiking. The trends are useful (pressure rises/falls). * Compass: very handy when navigating off‑road. The bearing memory and location indicator functions (via the app) add extra value (set a point, coming back to it etc.). * Thermometer: works decently well (though you need to remove watch, let it settle to ambient) but adequate. * Sunrise/sunset: surprisingly useful. I don’t need to pull out my phone constantly to check light conditions. Visibility & Readability The sapphire crystal is excellent—no hazing or major scratches. The anti‑reflective coating helps a lot in bright sun. The analog hands are large enough, clear; the Neobrite luminescence (glow) is decent, enough to read things after dark. The dials and subdials are intuitive (once you’ve gotten used to where everything is). Build & Style / Presence Let’s face it: this watch *looks* and *feels* like a flagship. It has weight, heft, and that “pro tool” aesthetic. The metal + resin + carbon/bio‑resin combination gives it both toughness and a refined edge. On‑wrist it commands attention without being gaudy. Added Modern Conveniences Bluetooth + app connectivity, location‑indicator functions, auto correction of altitude, ability to adjust settings via phone—these make using it much more convenient than purely analog/digital watches without these features. Things That Could Be Better (Trade‑Offs / Minor Drawbacks) Even though the watch is amazing, there *are* trade‑offs and “wish’d it were slightly more perfect” bits (just to give a balanced view): Size & Bulk It is large and thick. The 16‑mm thickness plus wide band make it feel chunky. On smaller wrists (or under tight shirt cuffs) it can be a bit intrusive. For everyday formal wear, it might be overkill. Complexity / Learning Curve There are a lot of modes, subdials, buttons. If you don’t read the manual (or use the app) to understand what each sensor, dial, subdial, or function is doing, it can be a bit confusing. Adjusting, calibrating sensors (esp compass/altimeter), knowing how to use bearing memory etc. requires some patience. Response Time / Sensor Precision Some sensors (like temperature) lag behind environment unless you let the watch stabilize. The compass occasionally requires recalibration in various magnetic environments. The altitude readings are accurate but not perfect—especially in changing weather conditions or when moving quickly. That’s expected, though, given the tech. Weight vs Comfort While 114g is lighter than some comparable tool watches, it’s still noticeable. After several hours of wear (especially doing strenuous things or arm movements) you feel that weight. The band is rugged but not super plush; for extended wear (e.g., all‑day hike), pairing with lighter straps (if possible) helps. Price This is a premium model, and the price reflects that. For those who need only basic functionality (such as time and stopwatch), there are more affordable G-Shocks that deliver excellent value. If you’re buying this, you’re paying partly for ruggedness, materials, prestige, and features. That’s fine if you use those; less so if many features will go unused. Limited “Smartwatch” features It’s not a smartwatch. No notifications, limited to noizable phone alerts, no fitness tracking (steps, heart rate etc.). If you expect those in a “connected” watch, you’ll be disappointed. It’s more tool‑watch + sensor + time keeping + ruggedness, rather than “smartwatch replacement.” My Experience Over 12+ Months Putting together how it’s held up and how I actually use it: * I’ve used it in rain, mud, sand. After sweaty sweaty days in hot sun & humid weather, it still functions beautifully. No issues with fogging or moisture infiltration. * Solar holds up nicely—even in seasons or locations where sun is sparse, the power reserve stays healthy. * The Bluetooth + app still functions well: occasionally a firmware downward tweak, but generally stable. Calibrating sensors via the app has been easier than fiddling with buttons. * The watch feels like it could survive decades of rugged use. The case, crystal, bezel guards still look solid. Some light paint wear/finish wear on button edges, but given how much punishment it’s seen, that’s totally acceptable. * I tend to wear it more than dress watches now, even in urban / work settings, because it gives me peace of mind: “I don’t need to baby this one.” Should You Get One? Who It’s Best For Given everything, I think this watch is worth it, if you fall into one or more of these categories: * You spend a lot of time outdoors (hiking, camping, fishing, construction, fieldwork etc.), and need a rugged, reliable watch with robust sensors. * You appreciate tool‑watches more than fashion watches. Function over frivolity. * You want features like solar charging + radio time sync + compass/altimeter/barometer built in, so that you’re not pulling out multiple devices. * You don’t mind size / bulk; you want toughness and don’t care much about a thin profile. Final Thoughts After over a year, the Casio G‑Shock GWG‑B1000‑1AJF isn’t just good—it’s impressive in nearly every respect it sets out to deliver. The build, durability, sensors, power, and utility justify the cost for those who actually need them. It’s not perfect, but its imperfections are small compared to the strengths. This is a beast of a watch that works as hard as you do, and will keep up through nearly anything you throw at it, and will likely continue to work and survive after a Zombie Apocalypse.
R**N
One of the best Casio Mudmasters made well worth it, this is my second Mudmaster and was well worth the price. If you can afford it go for it you will not be sorry, the pictures do not do it justice it is much better looking in person! Also do not believe the post about it being hard to set up all you need to do is connect it to the phone app and it does it all by itself. Total set up time was around 30 to 45 seconds! After a few days with this I can only say that this is by far the best G-Shock that I have ever owned, it is a pure masterpiece and it works great, as I said before if you can afford it, you will not be sorry it is well worth the price although it came real close to my cut off price of $1000 dollars. I do not feel that any watch is worth that much no matter who makes it.
N**L
Wonderful , my grandson was very happy to receive his g-shick on time
D**L
I have purchased a number of G-SHOCK watches, all have been solid and I still have them. The MudMaster is definitely my favorite. Solid build quality and design.. The features all work flawlessly and pairing with the phone is flawless. Definite BUY!
A**R
Most accurate and perfect watch ever. Bullit proof construction. No batteries to change, no winding, looks cool, easy to read without glasses. It never runs out of power, requires no charging or maintenance. Even has a light. Water proof. I wear it more than my Rolex President, Omega, Rado, and Vacherons. It is the best watch, dollar for dollar, I have ever owned.
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