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999ginger Occasional Visitor
Joined: Mar 10, 2006 Posts: 14
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Posted: Fri Mar 10, 2006 9:27 pm Post subject: GPSmap60Csx co-ordinates |
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Hi
Can anybody explain why when the 60CSx is set for Position Format of Brtish Grid and Map Datum of Ord Srvy GB the location is given only as 5 digits after the map tile characters ie NS82583. I thought I'd get at least 6 digit if not 8 digit reference
Thanks |
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JimmyTheHand Frequent Visitor
Joined: Apr 16, 2005 Posts: 386
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Posted: Sun Mar 12, 2006 2:04 pm Post subject: Re: GPSmap60Csx co-ordinates |
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999ginger wrote: | Hi
Can anybody explain why when the 60CSx is set for Position Format of Brtish Grid and Map Datum of Ord Srvy GB the location is given only as 5 digits after the map tile characters ie NS82583. I thought I'd get at least 6 digit if not 8 digit reference
Thanks |
Are you not sure you aren't seeing the first half of a 10 digit reference? _________________ J. |
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ernieb Occasional Visitor
Joined: Aug 16, 2004 Posts: 42
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Posted: Thu Mar 23, 2006 3:27 pm Post subject: |
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Hi,
I've just bought the 60CSx and think that the rest of the number is just below the number you quoted but preceded by BNG (I guess for bearing??) so it's all there - a 5 digit reference.
I would want on occasion to reduce the number range from 5 digits to say 3 or 4 but can not find a menu option to do that - any ideas? I've mailed Garmin to ask support this question. It's similar when using Mapsend TOPO GB.
Cheers
ernieb |
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999ginger Occasional Visitor
Joined: Mar 10, 2006 Posts: 14
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Posted: Thu Mar 23, 2006 3:39 pm Post subject: |
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Thanks ErnieB
I've done some work with it and I've concluded that the BNG is "British National Grid". I thought it was bearing as well!!
Your right about the 10 digit reference but I can't work out a way to reduce it. |
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ernieb Occasional Visitor
Joined: Aug 16, 2004 Posts: 42
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Posted: Thu Mar 23, 2006 4:19 pm Post subject: |
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Hi,
Yes - your British National Grid sounds correct - I'll post any update from Garmin if and when I get a reply!
ernieb |
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ernieb Occasional Visitor
Joined: Aug 16, 2004 Posts: 42
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Posted: Thu Mar 23, 2006 6:57 pm Post subject: |
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Hi,
I got a reply from Garmin and there is no way to reduce the resolution of the OSGB co-ordinates from the set 10 figure. (My Meridan Colour does allow for this to happen)
Also I queried whether you could send new mapping data to add to data already sent to the mirco sd card - reply was it gets wiped out each time you send the information. SO if you need a local set of maps and maps for a trip you need to select and send both - if you have the space. I've just ordered a 512Mb card to replace the 64Mb. Also there is no way to manage the sd card from the GPS other than know it's size and record the size your sending from the GB TOPO.
Cheers
ernieb |
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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: Thu Mar 23, 2006 11:55 pm Post subject: Re: GPSmap60Csx co-ordinates |
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999ginger wrote: | Can anybody explain why when the 60CSx is set for Position Format of Brtish Grid and Map Datum of Ord Srvy GB the location is given only as 5 digits after the map tile characters ie NS82583. I thought I'd get at least 6 digit if not 8 digit reference |
So the Garmin says something like:
TQ 37408
BNG 80343
and you want a 6 or 8 digit reference then drop the least significant digits ie:
TQ 37408 80343
TQ 3740 8034
TQ 374 803
These give 1, 10 and 100 meter accuracies respectively.
Hope that makes sense! _________________ Gone fishing! |
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ernieb Occasional Visitor
Joined: Aug 16, 2004 Posts: 42
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Posted: Fri Mar 24, 2006 10:28 am Post subject: |
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Skippy,
You're correct BUT the Garmin GPS always expects a 10 digit number you can not drop the ones you do not want to use you must pad out the number with zero's.
I had expected that there would be an option, when setting the map reference to OSGB, to set the number of significant digits you would want to use - this is option offered by other GPS manufactures firmware.
Cheers
ernieb |
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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: Fri Mar 24, 2006 4:07 pm Post subject: |
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ernieb wrote: | the Garmin GPS always expects a 10 digit number |
OK, I see your point about the GPS having an option to degrade the accuracy for you but I don't find it to be such a problem in normal use - I just add or drop the two extra digits. _________________ Gone fishing! |
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