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Your gps will be absolutely accurate (within 0.10 mph)
Your boat speedo will be +/- 10% usually but some are worse than that. The boat speedo is just a hit/miss on being right. At some speed they are usually right but all other speeds they will be off. -- Tony my boats at http://t.thomas.home.mchsi.com "JGK" wrote in message . .. Just curious as to the accuracy between the two. The speedometer in my boat is a standard speedo nothing special, the GPS is a Hummingbird Matrix 25 which I just got a week or two ago. After a few outings I noticed that there is at times a considerable difference between the two and other times they seem spot on. Can't quite figure that one out. Would a head current account for the boats speedometer to appear at a higher MPH than the GPS? |
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