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I did.

One issue though, be careful the pressure doesnt break the LCD in the actual watch receiver - mine was ok on a 12m dive but ive had a mobile phone screen break before now on a 35m dive when i forgot to take it out of pocket pre dive.

As for pulse, only done it once, was a fairly relaxed dive and was around the 80 mark for me. Highest rate was kitting up which i absolutely hate and get knackered doing.

Will try it again next time.

Not sure what the affect of being frozen will have on it but as winter is here i suspect i'll find out.