The Instinct looks perfect on paper as a rowing watch. Good water resistance, hard wearing, less clunky than a fenix and brightly coloured so you can find it if it drops in the drink.
In real life the stroke rate is spot on, the GPS is pretty close and the heart rate monitor is horrible. I tried everything for 3 months and it was never accurate when rowing. Reading 73 bpm instead of 153 bpm is just not acceptable. I do not know if I had a duff watch from the start or if it was because of the obsolete heart rate monitor on the Instinct.
Anyway, I got rid of the original Instinct and got hold of an Instinct solar. Thanks to excellent Garmin customer support. The stroke rate count is now perfect, GPS is okay and heart rate is very accurate when rowing.
I strongly suggest serious rowers avoid the original Instinct, but the Instinct Solar is worth the extra investment.