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markmcrobie
Occasional Visitor
Joined: Sep 26, 2006
Posts: 50
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 Posted: Tue Sep 26, 2006 7:29 pm Post subject: SIrf mode/NMEA |
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| What's the differnce, and what's best to use for in car nav with TT6 and how do I change it? Thanks! |
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mikealder
Pocket GPS Moderator
Joined: Jan 14, 2005
Posts: 19638
Location: Blackpool , Lancs
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| Posted: Tue Sep 26, 2006 7:33 pm Post subject: |
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For a start the GPS MUST be NMEA mode, I wouldn't get too hung up about the firmware version or anything else for that matter for now (saves answering your other post).
Simply try using the device as it stands, if you mess around switching modes/ loading firmware there is a chance it will not play again without a full reset, simply put it to good use UNLESS you have a very good reason to mess around with it.
I use two 236 units and very seldom mess around with either of them - Mike |
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markmcrobie
Occasional Visitor
Joined: Sep 26, 2006
Posts: 50
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| Posted: Tue Sep 26, 2006 7:48 pm Post subject: |
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| mikealder wrote: | For a start the GPS MUST be NMEA mode, I wouldn't get too hung up about the firmware version or anything else for that matter for now (saves answering your other post).
Simply try using the device as it stands, if you mess around switching modes/ loading firmware there is a chance it will not play again without a full reset, simply put it to good use UNLESS you have a very good reason to mess around with it.
I use two 236 units and very seldom mess around with either of them - Mike |
Cheers, and I agree - mine works, so I'll leave it alone. I'm just curious as to why something with a *SiRF* III chipset should be used in NMEA mode, despite the fact it has a *SiRF* mode - seems a bit odd.
Also, out of curiousity, what's "Static Navigation" and why is better for in-car nav, but for walking/hiking, it's better turned off? |
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mikealder
Pocket GPS Moderator
Joined: Jan 14, 2005
Posts: 19638
Location: Blackpool , Lancs
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| Posted: Tue Sep 26, 2006 8:02 pm Post subject: |
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SiRF-III chipset is the hardware within the GPS device, the SiRF or NMEA protocol is the data transfer mode the device is using - easy to confuse the two.
To switch SN on/ off you need to first go to SiRF mode to toggle the setting to the required mode (On for in the car, Off for when walking), there is a simple application to effect this mode switch linked to from HERE - Please note I have had trouble getting this to work correctly with WM2005 devices, but it works great on WM2003SE, only use it IF you find you need it - Mike |
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markmcrobie
Occasional Visitor
Joined: Sep 26, 2006
Posts: 50
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| Posted: Tue Sep 26, 2006 8:18 pm Post subject: |
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Thanks, I have Wm2005, I probably won't need it as I don't do much walking.
But out of curiousity, what IS Static Navigation mode and what does it do? |
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Skippy
Pocket GPS Verifier
Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
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| Posted: Tue Sep 26, 2006 9:23 pm Post subject: |
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| markmcrobie wrote: | | But out of curiousity, what IS Static Navigation mode and what does it do? |
The GPS position wanders about over time. If you sit still for a couple of minutes the position can randomly drift by 50 feet or more. Static navigation tries to suppress this drift by locking your position when you stop and not updating it till you move (say) over 50 feet or at more than 10 MPH.
When walking you are only doing maybe 3 MPH and it's not sure if you are actually moving or if it is just seeing the inherent position drift the GPS receivers experience. In this situation, static navigation causes very sluggish, jerky updates in positions and you need to disable it.
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