The Polar rcx5 Heart Rate Monitor and gps Sport Watch is a worthy splurge for triathletes wanting to take their training to a new level. Not only is it beautiful and wearable outside of training, its Smart Coaching features include Endurance Programs, Fitness Test and Running Index – all of which will revolutionize your multisport performances. Customize your workload with the ZoneOptimizer – an audible alarm is linked to your target zones. Free downloadable plans are available from polarpersonaltrainer. com with the Polar DataLink. Switch easily between swimming, biking and running and benefit from cadence, stride and speed sensors as well. Polar recommends using the Polar T31 coded transmitter if swimming in salt water or highly chlorinated water.