Could be 4 stars - but is practically unusable

Updating to reflect the lasted version:
PING gave an accurate explanation why it drains the battery - but doesnt react to most simple way to deal with it:
MAKE THE Heart Rate Monitoring OPTIONAL!!
I dont care about my heart rate when playing golf - but rounds of more than 4 hrs DO HAPPEN! And Im not always starting with a 100% fully charged battery.
Turning off the HR sensor is the most effective battery saver: at least make it an optional setting!

-----------
The Apple watch is waiting to become a useful tool for golfers - and PING provides a good approach for playing a round.

Yet - and thats the killer - with watchOS 3 it turns on heart rate monitoring when you start a round and this is draining the battery within 2hrs. I gave it 2 tries with a full battery and never made it past the front nine before running into low battery.

PING: if you read this, make the HR monitoring optional via user switch (or turn it off at all). Im sure it can then last a full round and I will happily remove this berating.

The best app - when practically unusable - isnt worth many stars.

On the more positive side:
The UI (with WatchOS 3) is now sufficiently fast and presents actual distances.
Scoring and navigation between holes is done nicely.
Switching between green-view and hole-view is easy - but one cant adjust the flag position and not zoom in to fairways to plan for a layup shot. :(

Swing metrics and practices: no review; its just not my thing. One can become a good player and practice well without these toys.

Summary:
PING is on a good way - but currently the app is not usable to play a round of golf.
Fix it and it will be 4 stars with room to eventually get 5.

Jupp66 about PING, v3.1.1