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Casio’s heart-rate workout watch is the DW-H5600; “DW-GH5600” appears to be a model-name typo. This guide follows Casio’s Watch Operation Guide 3516 and current official DW-H5600 product specifications. The watch can record activities and measure heart rate at the wrist, but it does not have built-in GPS: a paired smartphone can supply GPS data for distance adjustment and GPS-dependent running analysis.
Set up the watch before a workout
Wear it securely and create a profile
Position the watch so the optical sensor on the case back sits securely against your wrist. Casio recommends correct fit and a completed profile before heart-rate measurement because fit and profile information affect displayed measurements. The watch uses an optical sensor to detect changes in blood flow; its accelerometer supports step counting and activity measurement. Casio Watch Operation Guide 3516
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Choose heart-rate tracking
- From the current-time screen, enter Control Mode.
- Open Settings → General Settings → HR Tracking.
- Select ON, ACTIVITY & NIGHT TIME ON, or OFF.
Casio characterizes battery consumption as high for ON, moderate for ACTIVITY & NIGHT TIME ON, and low for OFF. ON enables daytime heart-rate tracking and broader heart-rate-dependent functions, including sleep measurement. ACTIVITY & NIGHT TIME ON limits measurement to activity and the configured night period. OFF reduces heart-rate-dependent functions. Choose based on the coverage and battery use you need rather than assuming every mode records continuously.
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- From the current-time screen, press A to enter Activity Mode.
- Press C to choose an activity, such as running, walking, gym workout, or interval training.
- Check that the activity and measurement screen are the ones you intend to use, then press A to start.
- When the activity is finished, stop the measurement and follow the on-screen prompts to save or discard the result.
Running and walking can display distance, speed, time, and pace, as well as heart rate and calories burned. Gym workouts and interval training display time, heart rate, calories burned, and related data. The exact log fields depend on the activity and settings; Casio lists possible fields including distance, pace, Running Index, calories, energy sources, heart rate and maximum heart rate, cardio load, cadence or pitch, and stride. Casio DW-H5600-1A2 specifications
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Set heart-rate zones and alerts
- Open the activity’s heart-rate measurement screen.
- Open its heart-rate settings, select HR TARGET ZONE, and choose the desired zone.
- In the same settings area, enable HR ZONE ALERT if you want an out-of-zone notification.
- Keep the heart-rate measurement screen displayed during the workout if you expect the alert to operate.
The watch notifies you by sound and/or vibration when your heart rate is outside the selected zone. If you remain outside the zone, Casio’s guide says another notification occurs at one-minute intervals. The alert operates only while the heart-rate measurement screen is displayed.
Use the interval timer
For interval training, choose the interval activity in Activity Mode, configure the intervals, and start timing. During the session, use the displayed controls to pause or reset as needed. At the end, choose whether to save or discard the result; saved interval results appear on the watch, where you can scroll through summary screens. Button behavior and on-screen prompts are documented in Casio’s 3516 operation guide; follow the prompts shown for your watch rather than relying on a generic timer sequence.
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Review a workout and its laps
- After stopping a measurement, review the summary shown on the watch.
- To return to saved sessions, open Activity Log and choose a record.
- Browse the record’s summary screens; open lap details when available.
- Transfer activity data to the CASIO WATCHES app if you want to view records and graphs there.
Casio’s guide says watch memory holds up to 100 log records. The current official DW-H5600-1A2 specification page lists up to 100 runs with up to 200 laps each, and a maximum of 200 laps per run. Which fields and app views appear can depend on activity, setup, phone support, and enabled measurement settings. App route displays depend on GPS tracking from a connected smartphone. Casio also describes life logs, cardio load, and Nightly Recharge recovery and sleep views.
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Understand GPS and running analysis
The DW-H5600 does not have built-in GPS. Casio says a paired smartphone’s GPS can adjust distance captured by the watch’s accelerometer. Running Index and race-performance prediction specifically depend on using GPS from a paired smartphone. Without that phone GPS input, do not assume the watch is independently recording a GPS route or providing those GPS-dependent running analyses. Casio’s reviewed guide explains phone linking and app use but does not establish a current compatibility matrix for every phone and operating-system version; check Casio support or the live CASIO WATCHES app listing for your device.
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What the heart-rate readings can—and cannot—tell you
Casio lists a heart-rate measurement range of 30–220 bpm for the DW-H5600-1A2. This is a specification range, not a guarantee that readings are accurate throughout that range. In the 2025 Watch Operation Guide 3516, Casio states: “All of this means that heart rate values displayed by the watch are approximate, and no guarantees are made concerning their accuracy.” The heart-rate feature is intended for recreational purposes, not medical measurement or diagnosis.
Fit, individual wrist characteristics, training type and intensity, and sweat, dirt, or other material near the sensor can affect results. Low temperatures or other conditions that reduce blood flow, tattoos, sunscreen or lotion, and insect repellent may interfere with pulse detection. Casio says blood-oxygen measurement is for general health maintenance and is not intended to diagnose disease or function as a medical device; do not treat either feature as a substitute for clinical advice.
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