Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Do you HAVE to use the shoe sensor when you run with this watch? Thanks-
Document: !The only thing I would think they would improve would be the ability to communicate with the Iphone App. When I used it, the app does not know the watch is there. They both use the same footsensor, but can't communicate with each other. I would just fix that.Everything else about the watch is awesome. If you're an avid runner, or you just want to wear a watch that make you LOOK LIKE a runner, I highly recommend it.
This has seriously helped my running LOVE IT super easy to use too. It seems to be very in sync with what distance it is going as well
This was my second Nike+. It is an awesome product and it did everything they said it would. The only drawback is that it won't communicate with the Iphone App. So, you can only use one at the time. You won't be able to upload your runs to Nike.com immediately, but I was not too worried about that.
I will have to purchase a different watch for my warmer-weather runs.
i got this watch for my husband and so far he loves it. it met every expectation, he wears it all the time.
I read many reviews for this product and people complained about long waits for GPS sync. Most of the time it happens within 10 seconds for me, which is about the time it takes to get from my door to the sidewalk. One time I had it take about 30 seconds. I do sync with my computer after each use, so maybe that helps.Also, Nike rates the battery runtime at 8 hours under regular use. I'm not sure what they consider regular use.
This watch is is really accurate and fits comfortably on my wrist. The only issue that I have with the watch is the back light is difficult to turn on. Other than that the battery holds well, and the Nike app is a great tool to keep track of your runs!
I was pleased with this watch all winter. It worked well, seemed to be pretty accurate and had a nice backlit screen for runs in the dark. However, once spring came and I started running without long sleeves, I found it very uncomfortable on my wrist. If I made it tight, it cut off the circulation to my hand. If I loosened it, it jammed in to the bones in my wrist with each arm pump.
My new sportswatch is great. It connected up in seconds and was super easy to set up. It tracks calories burned and connects up to the Nike + website to show your route. I love it!
It came in great timing, does exactly was said to do. It is a great tracking product for distance in walking, hiking, running! !
Answer: If you are outside you do not need a shoe sensor. The GPS will measure your location, distance, and speed.  If inside, you will need the shoe sensor since a GPS will not work indoors. It needs a view of the sky to get satellite reception.