Received the latest R10 update and was excited to test it out so I used my standard outdoor setup that has a golf net 10' from the shot area and the R10 7' behind it. I've use this exact setup since spring and am familiar with my distances and stats.
The release notes indicate better head speed measurements with this update, so I figured it would give more accurate distances. Shockingly, the numbers are possibly worse than before.
On the course, my driver gives 210-230 carry, with most drives rolling out 230-260. Using the Garmin Golf sim with the 4.2 update, not a single drive carried 200yds. Most were 180-195.
I also use E6 golf and increase my altitude setting to give better distances, and even it was coming up short compared to previous E6 sessions.
I also looked at the head speed numbers for various clubs and they were all down 10%. Driver was showing in the mid to high 80's and ball speed never getting above 130mph. A MeVo device and a cheap head speed radar show head speeds in the 95-100 range with ball speeds in the high 130's to 140's.
So basically, everything with 4.2 is as it was before. Maybe worse because previously with Garmin Golf, it would sometimes show a drives with up to about 210 carry.
Garmin - you've really got to give us an option to calibrate to our real playing conditions. Numerous others have requested this. At the simplest level, let us set a % change for the head speed. This simple option would eliminate our biggest complaint in a manner that's trivially easy to implement and use.
Until then, I'll just keep using E6 and setting my altitude to 4,000 to 6,000 feet. That seems to give me simulations that closely match my playing experience where I am, near sea level.