no it cannot
A heliograph is a device for sending messages or signaling by flashing the sun's rays from a mirror.
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It is a device that senses smoke.
A signaling device.
Fault.
A sound signaling device
A Sound Signaling Device.
Sound signaling device
smoke grenades are canister type grenades used as ground-to-ground or ground-to-air signaling devices, target or landing zone marking devices
As a safety/warning device.
In Texas, vessels longer than 39.4 feet are required to have a sound signaling device, such as a whistle or horn, that can produce a sound signal audible for at least one-half nautical mile. Additionally, they must be equipped with a means to signal distress, such as a bell or similar device. The sound signaling device must be easily accessible and operable from the helm.
An apparatus for signaling is a device used to attract attention or communicate a message. This can include items like a whistle, a flag, or a flare, which are commonly used in emergency situations to call for help.