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From Fellrnr.com, Running tips
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For ultramarathon running the Ambit3 Peak has the battery life for runners that expect to be moving during the [[Second Dawn]], though the GPS accuracy is a little impaired. See [[Best Running Watch#Watches for Ultrarunning| Watches for Ultrarunning]] for more details.
=Which Version?=
The Ambit3 comes in five versions with different functionality. I think the "Run" has the best value for money, but depending on your usage you may want to pay for a more expensive version. If you're a cyclist, the "Sport" might be worthwhile, though I won't comment further as I focus purely on running usage. If you're an ultrarunner, then I think the "Peak" version could be well worth it. The Sapphire is only worthwhile if you're hard on your gear and want the damage resistance. A new version called "Vertical" that is part way between the Peak and the Sport versions. One intriguing difference for the Vertical version is that it can make use of the Russian version of GPS called GLONASS. This suggests a different GPS chipset, so the accuracy could be different to other versions.(They all use SiRFstarV, but that's a family of chipsets. For instance the [http://gpsworld.com/csr-launches-sirfstarv-5e-gnss-location-solution/ SiRFstarV 5e version supports GLONASS].)
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