Casio has announced the GBX-H5600, a new addition to the G-LIDE line within its G-SHOCK family — and the first G-LIDE watch to include a heart rate monitor. The watch is positioned for surfers and outdoor athletes but is built broadly enough for everyday fitness use. G-LIDE has long carried the features that coastal and water sports enthusiasts expect: tide graphs showing water level changes and moon data tracking lunar phases.