Which communication method is least effective in the context of deep, narrow canyons?

In deep, narrow canyons, satellite phones tend to be the least effective communication method due to their reliance on a clear line of sight to satellites. Canyons can obstruct signals with their steep walls, making it difficult for satellite phones to maintain a consistent connection. The satellite signal can be blocked or reflected by the terrain, resulting in poor call quality or dropped connections.

In comparison, two-way radios and walkie-talkies operate on VHF/UHF radio frequencies, which can sometimes penetrate obstacles better than satellite signals, allowing for communication even in challenging terrain. CB radios also operate on a different frequency and can be more effective in canyons compared to satellite phones, though their range may be limited.

Therefore, the unique geographical features of deep, narrow canyons significantly hinder the functionality of satellite phones, making them the least suitable choice for effective communication in such environments.