the features of the watch include (among others) a date function. the section of the river that we float will depend on the length of the trip (3 day, 2 day, or single day) as well as river conditions. set the icy water and dish soap on a towel because things are about to get wet! the negative of this is that you obviously need to work and produce something of value to get that one-off fee. i bought a six pack and i will finish but...a real bummer, this one. it was just too long of a trip and too long for travel. 