The Spark 3 is a good fitness tracker for triathletes. It also features a unique and very simple-to-use tracking system. If you're prepared to pay extra, you can get a model with a heart rate monitor and music playback.
Pro The mapping features work great and are easy to use
You'll never have to worry about getting lost with a Spark 3 on your wrist. First of all, you can create a new interesting route in the app from the comfort of your home and then simply follow it with your watch during the run. Or you can record your whole route as you run or hike and then trace back your steps in case you get lost.