Watch, handheld or phone

Three devices that do the same job and fail in completely different ways.

All three will tell you where you are. The differences show up in rain, in gloves, at low temperature, and after they hit a rock.

Phone

Best screen, best map rendering, best planning tools, and free if you already own one. Also the most fragile, the most cold-sensitive, and the one you need working for everything else. A wet touchscreen is close to unusable, and gloves make it worse. Excellent primary tool, poor sole tool.

Handheld unit

Physical buttons that work wet and gloved, a transflective screen that gets more readable in bright sun rather than less, days of battery from AA cells you can replace in the field, and a case built to be dropped. The screen is small and the interface is dated. It is the device that still works when the day has gone badly, which is the entire argument for it.

Watch

Always on your wrist, which means you actually look at it, and it records the whole day without any decision on your part. The screen is too small for real navigation but entirely sufficient for a breadcrumb line and a bearing. Battery life varies enormously with recording interval and whether multi-band GNSS is enabled.

Choosing

For most people the honest answer is a phone with offline maps, a power bank kept warm, and a paper map and compass as the genuinely independent backup. A handheld earns its place on multi-day trips away from charging, and in winter, where replaceable lithium cells beat any internal battery.

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