From high tech to low tech. The last article depicted the latest in intra-squad communications but there are more traditional methods. Although rarely used by US forces, the British continue to utilize a comms line when setting up a patrol harbour (base). Naturally, this can’t be used while patrolling but it is a silent means of communication while lying up. The concept is to string lines between emplacements in order to signal one another. Codes are worked out to signify different messages, for example, two tugs means stand to.
Comms Cord on a Reel from RV Ops
Comms cord on a reel with a handy carabiner clip is available from RV Ops in the UK.