b'generally found, signaling the absence or incapacity of the officer on the bridge. Of course, all of this can be avoided bysimplyinteractingwiththenetworkedelectronics. To simplify the system, some BNWAS can be outfi tted with motion sensors installed on the bridge. These sensors detect the watch officers presence and fi tness. They reset the timer whenevertheysenseactivity,signifi cantlyreducingthe frequency of alarms and the need for the watch officer to respond to them. Such valuable additions are appreciated by officers who fi nd themselves at the mercy of frequent alarms, contributing to what some mariners refer to as alarm fatigue.In recent years, there have been many documented incidents around the globe resulting in the loss of life and property where the BNWAS system was deactivated at a terrible cost. Such events are thoroughly investigated, reported on, and recommendations are given after the fact. We can study such incidents and calculate the actions and procedures that could have prevented them. What we cant calculate is the number of mishaps entirely avoided due to BNWAS ensuring that the watch officer is alert and active. While there is no Magic 8-Ball to quantify the eff ectiveness of BNWAS, we can make an educated guess, Signs point to yes.BR500-bridge Bridge Navigational Watch Alarm SystemsPRECISE 360 PROPULSION EXCEED GLOBAL EMISSIONS STANDARDS PLUS FULL AUXILIARY POWEROperate a lightweight vessel equipped with hybrid or electric engines. Reduce your operating and maintenance costs. Minimize your environmental impact. BUILD A CARBON FIBER FERRYTwin Disc Marine Control Drives (MCDs) allow variable propellerMARINE speedfrom full engine output to slower than engine idlewhileCONTROL splitting main engine power to drive FiFi pumps or other auxiliaryDRIVEequipment. The MCD-2000/4000/5000 series covers extended diesel power requirements from 1680 kW (2280 HP) to 5250 kW (7130 HP) with heat dissipation capabilities up to 450 kW (610 HP).And our Veth Z-drives provide 360 thrust for optimal vessel maneuverability and positioning.If you want the ultimate in slow-speed maneuverability, highly accurate positioning and simultaneous, full-firefighting capability, specify Twin Disc and Veth Propulsion on your next tug build.VETHFor expert engineering assistance to assure your optimal product specificationsZ-DRIVEand performance, contact Klaus@TwinDisc.com.Learn about Americas only carbon T- and K-Class ferry builder:www.ARCADIA-ALLIANCE.comAUGUST 2021 13 FOGHORN FOCUS: SAFETY'