J-Word Play #29

September already! Although it may be considered autumn in Japan, we still have a tad bit more summer left in the U.S. Make it count.

Our riddle for today is:

夏の晴れた日に使うナビってどんなナビ？
(なつのはれたひにつかうナビってどんなナビ?)

As usual, please send answers to blueshoe[at]jadij.com. Good luck!