What is your goal here? If you want to look at maps and do orienteering, a phone is probably better, and I hope you are bringing it with you anyhow in case you need to call for help. You can turn it off or put it in airplane. If you want an odometer or to make GPS tracks, you probably want the GPS
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."