| CPC A63B 24/0021 (2013.01) [A63B 24/0003 (2013.01); A63B 2024/0031 (2013.01); A63B 2024/0034 (2013.01); A63B 2024/0053 (2013.01); A63B 2220/836 (2013.01); A63B 2225/50 (2013.01)] | 6 Claims |

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1. A golf ball location ascertaining method comprising:
a step of checking whether a golfer takes a swing motion in a golf field;
a step of ascertaining a motion location at which the swing motion is taken when it is determined that the swing motion is taken; and
a step of ascertaining a location of the golf ball on a golf course by using golf course data on the golf field and the motion location,
wherein there are a plurality of golfers, each of the plurality of golfers has a portable device capable of ascertaining his or her location, and whether the swing motion is made can be ascertained by checking a positional relationship between the plurality of golfers.
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