Swimming in non square curved pools

Former Member
Former Member
Hi. I am on holiday. There's a pool here which 1) Is curved in different shapes 2) The staff does not know the length

I just want to track / record my swim in minutes, approx cals burned (maybe metres, if possible), not that professional yet that I need laps and strokes and so on. Any idea how I do this? Open water?

Thx a lot.