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paulcamb
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Joined: Jul 15, 2006
Posts: 1
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 Posted: Thu Jul 20, 2006 11:33 am Post subject: Newbie questions |
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I have just purchased a 520 and at the moment am pleased but not been on a long trip yet. A couple of questions /comments
1. How accurate are the speed readings?
2. How long on average should it take a GPS fix on starting
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darrenwright
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Joined: Jul 16, 2006
Posts: 46
Location: Crosby,Liverpool
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| Posted: Thu Jul 20, 2006 2:03 pm Post subject: |
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i have had my navman icn520 for around 3 weeks now, to get a sat reading can take around 5/10mins from cold.....i bought the external antenna & it now picks up a sat signal within 40 seconds cold.
when u set it to do your route just check the route before you set off.
daz |
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Withome
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Joined: May 13, 2005
Posts: 17
Location: Derby, UK
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| Posted: Sun Jul 23, 2006 12:24 pm Post subject: |
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I have noticed that the speed readings differ from those on my car spedometer. Navman reading is usually lower by about 5 or 10%. Not sure why this is - you would expect that that GPS tracking would be more accurate than that.
The GPS fix should only take a few seconds when you switch on your 520 in a location close to where it was switched off. Mine was always 5 - 10 seconds but much longer if you switch it on in a new location - probably 30 - 60 seconds and occasionally even longer. |
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Anita
Pocket GPS Moderator
Joined: Mar 15, 2006
Posts: 3219
Location: Windlesham, Surrey
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| Posted: Sun Jul 23, 2006 12:44 pm Post subject: |
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| Withome wrote: | | Navman reading is usually lower by about 5 or 10%. Not sure why this is - you would expect that that GPS tracking would be more accurate than that. |
I think you'll find it's the car speedometer that's inaccurate, probably intentionally.
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Anita
TomTom VIA 135 - App 12.075
UK map 1130.12368
Samsung Galaxy S21 |
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Tim Buxton
Pocket GPS Moderator
Joined: 14/09/2002 20:56:18
Posts: 5231
Location: Surrey, United Kingdom
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| Posted: Sun Jul 23, 2006 12:50 pm Post subject: |
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| Anita wrote: | | I think you'll find it's the car speedometer that's inaccurate, probably intentionally. |
It is indeed the car's speedo. They are allowed a tolerance of +10% and -0%. To avoid falling foul of the -0%, manufacturers err on the side of caution.
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