whats the best live tracking app for coaching

am currently coaching one of my good friends. he is in training for the Mauritius Ocean Classic coming up. and when he is off shore few km hard to get a visual on him in his location. i want to be able to have a live tracking app that i can see his course speed and it being live. been using map fitness app where is has live tracking for friends. some have about 10 mins before they send data down. so if he changes course of even comes into shore i dont see it until later. in case he gets in trouble i cant see exactly where he is. what i been using is two iphones. one is on his PFD and map myfittness app is runing and on my iphone it has same app. and i can see my friend is working out live it lets me know its live and i can monitor his workout. but is there other apps where i can monitor LIVE GPS
any help would be great.

thanks in advance

Garmin 920 supports live tracking.

www.dcrainmaker.com/2014/11/garmin-forer...xt-depth-review.html

Try the Motion X GPS app. User can set how often it sends location data down to every 30 secs. Great free app.

Cheers

Endomondo works well for me, runs on any GPS enabled smart phone

MotionX (iPhone only) or RaceQ (iphone & android).

Check the fine print, Mauritius is pretty remote.