I don't use any aids except my watch - don't have a GPS or a Garmin, haven't used my HRM in probably 5 years. I have an Ipod which I never use, don't even have my mobile phone switched on most of the time.
Cutting the legs and arms of a wetsuit isn't a problem, I always have to cut mine as I have a 28in inside leg and my arms are not long either. Hubby cuts the legs on his a bit too, not because he's short, he's 6ft 2", but because he has size 14 feet! Makes it hard to get the suit off in a hurry in transition.