Casio Pro Trek PRW-70

The PRW-70 uses Triple Sensor Version 3 for altitude, barometric pressure and temperature, and compass readings. Casio also lists a tide graph, moon data, and a fishing-time function, which is why this model targets both mountain and water activities. [Casio PRW-70 specifications](https://www.casio.com/jp/watches/protrek/products/prw-70/)

Yes, the official Pro Trek page specifies 20-bar water resistance and calls out sea kayaking and fishing use. Its fishing-time display uses moon position and moon age as inputs, so it is a planning aid rather than a guarantee that fish will bite. [Casio PRW-70 specifications](https://www.casio.com/jp/watches/protrek/products/prw-70/)

The PRW-70 combines Tough Solar with Multi Band 6 radio timekeeping, which can receive standard time signals from six stations where coverage is available. The watch can correct its time automatically in supported regions, but reception depends on location and conditions. [Casio PRW-70 specifications](https://www.casio.com/jp/watches/protrek/products/prw-70/)

The PRW-70 is the more water-focused model: it has 20-bar resistance, tide and moon displays, fishing time, and Multi Band 6, while the PRG-300 is listed at 100 meters and centers on Triple Sensor basics. That difference matters more than the shared Pro Trek name when choosing between a hiking watch and a marine-outdoor tool. [Casio PRW-70](https://www.casio.com/jp/watches/protrek/products/prw-70/) [Casio PRG-300](https://shop.casioca.com/products/archive/watches/pro-trek/prg300-1a2)