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A handheld CB radio is not suitable for emergency communications when bushwalking or ski touring due to its short range.
In an emergency it cannot be assumed another CB operator will be within range, listening on the same channel, and in a position to obtain emergency services assistance.
A walk in particular location may have a monitored UHF base station and repeater covering the area, but this would be unusual and should not be relied on.
Most handheld CB radios do not have a GPS, so they cannot be used to provide a location, unlike the alternative devices discussed on this site.
Their only advantage is that handheld CBs are cheap and easy to use.
CB radios are generally not worth carrying, except for group management purposes on, for example a navigation training exercise or beginners cross country ski instruction.