Casio Pro Trek PRG-300 vs Coros APEX 4 (42mm)
Weight and specs compared for 2026 — and which one to choose.
Lightweight outdoor GPS smartwatch with triple sensors, barometric pressure, and Tough Solar charging. Compact 56×47×12.6mm design.
Mountain sports GPS watch with dual-frequency satellite positioning for improved accuracy, ECG heart rhythm monitoring, and barometric altimeter for navigation
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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Casio Pro Trek PRG-300 vs Coros APEX 4 (42mm): which should you buy?
If saving weight is your priority, the Coros APEX 4 (42mm) wins — at 44 g it is 13 g (23%) lighter than the Casio Pro Trek PRG-300 (57 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest electronics page, or browse the full gear weight database.