Name: Surf Tracker2
Rating: 3.9 (153 reviews)
Author: bwd1

The ORIGINAL Surf Tracker: Track your surfing sessions in real time! This data field estimates the number of waves ridden using speed, time and distance thresholds to mark the start and end of a wave ride. Detailed info: https://forums.garmin.com/developer/connect-iq/f/showcase/521/data-field-surf-tracker

**This is a data field not an App...this means that you add the data field (ConnectIQ - Surf Tracker) into an existing Activity (SUP, Paddle,  etc) and set it to 1-field layout (ie. 1 page). 

Info shown (left to right): 
- the total number of waves ridden and the total wave ride time (minutes:seconds)
- the number of Left and Right wave rides. This is determined using the "Beach Facing Direction" in settings. It is the direction the beach is facing i.e the direction you are facing when looking at the water. 
- for your latest wave ride: wave ride time (seconds), maximum speed during the wave ride (km/hr or mph) and the distance covered (meters or yards). 
- the numbers in red show the maximum values during the activity for the wave ride time, speed and distance. 
- the top line shows the time of day and the bottom line shows the elapsed time.

NOTES: 
1) This data field must be used in a 1-field data screen inside an activity (or App). I use an Activity - Other - Paddle, but any activity with GPS ON should work. Open water swim will work but the GPS tracks are noisier since the sampling rate is lower. Some activities will smooth the speed data more than others and will give less accurate results (eg. a walking activity will not work as well as paddling or cycling). Vivoactive users try the Cycling activity, the Run activity will smooth the speed values too much to even out the Pace and this won't work well with the wave detection.

2) The summary stats and a speed/time plots are saved to Garmin Connect once the Activity is ended and saved. The stats from each wave ride can be saved to a text file using the instructions at the bottom of the page (advanced users only, unsupported).   

3) This has been tested many times with standup paddle surfing. It has taken a while to get the thresholds working accurately. See the forum link at the top for info on changing the speed, time and distance thresholds using the Garmin Connect Mobile app.
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To save each wave ride to a text file on your device, place a *.TXT file in the /GARMIN/APPS/LOGS folder on your device, where * is the name of the .PRG file in the /GARMIN/APPS folder. Look for a file that is ~12 kilobytes. On my device it is 69SI5820.PRG, so I would create an empty file in /GARMIN/APPS/LOGS/69SI5820.TXT

To find out the filename, uninstall Surf Tracker, make a note of the *.PRG files in the /GARMIN/APPS folder, install Surf Tracker then note which PRG file is new.

Sample output format:
Wave# TimeofDay WaveRideTime(sec) WaveRideMaxSpeed(kph) WaveRideDistance(m) 
1 07:26 20 28.8 113.4

I copy and paste the details into the notes section of the activity on Garmin Connect. The file will be appended to until it gets too big (10KB), then it will be overwritten. I had 3 days of sessions saved and it was only 1.8KB