horn installation

[Pelagic Captain]

I need to install a horn in my boat...12 volt system ...what is involved ...is there a horn ( system) that I can run a circuit from the battery through a momentary switch to the horn or does a horn require some sort of relay etc. to make it work..thanks in advance

[Tinman]

A momentary switch is fine, no relay needed. I use a momentary push-button switch with a waterproof rubber boot, both from West Marine.