![]() Think of bands on GPS like the radio station bands of AM and FM. Each GNSS has its band naming convention, but multi-band receiving is the same principle for each GNSS, even if some specifics are different. Multi-Band Functionality Garmin multi-band receivers like the 66sr display the satellites they have fixes for and their bands (like the E1 and E5a bands for Galileo here). Switching to "GPS only" gives me a usual accuracy of 10ft, which is respectable. You can't individually pick which GNSS systems to use. You can choose from GPS only, or all of the GNSS systems. The ability to use satellites from multiple GNSS systems allows the 66sr to pick and choose the best signals and determine your location. ![]() Having satellite fixes farther apart (in the outer circle) like 33 and 27 here will give you a better fix than having them all in the middle (closer to directly overhead). It's not a big deal the GNSS systems that the 66sr supports allow it to choose from over 100 satellites orbiting the earth. You can find BeiDou support on many smartphones, but not on Garmin GPS units (yet). The only (public) satellite constellation that is missing is BeiDou (China). The practical application of this is to have more satellites in the sky to choose from, making a fix quicker and allowing the chipset to select the best quality signals. The 66sr is a multi-GNSS receiver, and it can pick up signals from multiple satellite systems: GPS (USA), GLONASS (Russia), GALILEO (Europe) QZSS (Japan), and IRSS (India). It will help you understand how to get the most out of your GPS. ![]() If you're not familiar with how GPS works from a technical perspective, I highly recommend checking out my article explaining the concepts here. Although there are always variables when using a GPS unit, overall, the tracks you record on the 66sr should be the most accurate. If you consider that most trails are about 4 ft wide, and a human with their arms outstretched is generally around 6ft wide, this should be more than enough for navigating the backcountry. The 66sr can get a position very quickly and often with a 6ft (1.8m) level of accuracy. Overall the positioning accuracy and reliability was the highlight of this device. Since the positioning on the 66sr is likely the main draw, let's jump right into it. Garmin GPSMAP 66sr GPS Performance I can consistently get a 6ft accuracy reading on the GPSMAP 66r, which always beats my GPSMAP 66i, usually getting between 9-12ft of accuracy. ![]() All reviews on this site and independent and unsponsored. I was not paid by Garmin to do this review. I receive a small commission that helps offset website costs you pay nothing extra. You can support this website and these independent reviews by using the links above to purchase this or anything. Quick Links: Lowest Amazon Price - REI Price - 65s Price - Top Gear Picks (Apr 2023) ![]()
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