Home PageFacebookRSS News Feed
PocketGPS
Web
SatNav,GPS,Navigation
Pocket GPS World - SatNavs | GPS | Speed Cameras: Forums

Pocket GPS World :: View topic - Some observations after intensive use
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in for private messagesLog in for private messages   Log inLog in 

Some observations after intensive use

 
Post new topic   Reply to topic    Pocket GPS World Forum Index -> Satmap Active 10
View previous topic :: View next topic  
Author Message
goon525
Regular Visitor


Joined: Aug 25, 2005
Posts: 75

PostPosted: Sun May 03, 2009 4:09 pm    Post subject: Some observations after intensive use Reply with quote

Just back from a few days walking on the Isle of Wight, first time that my Satmap has been in use intensively for several days on the trot. A few observations:-

1 The rechargeable battery pack has proved just fine, full day walks ending with three blobs out of four still showing on the meter. This with machine and screen (at 60% brightness) left on all of the time. I don't know how accurate the blobs are, but I'd be pretty confident that it still had several hours left in it. A few hours recharging had it working fine next day.

2 As others have experienced, it can be sluggish getting first fix. Once it has the fix, it sticks to it come what may, but it's a bit embarrassing being beaten to it by a chep'n'cheerful early generation Garmin. It does seem to take ages after it's seen even eight or nine satellites to fix the position. This was a bit unpredictable though - at other times, it was perfectly fast. I suspect this could be fixed easily enough in firmware/software if Satmap wanted to.

3 Also as others have experienced, it consistently over-reads the distance walked. I got into a habit of hitting 'Stop' only for the longer lunch-break, not for five or ten minute stops. At the end of walks of between eight and twelve miles, I would say it had over-read by around 7%. Cheap'n'cheerful Garmins did better. Intriguingly, turning the track into a route at the end left one with pretty much a spot-on result. I don't know if this is a case of two errrors cancelling each other out, but again wonder if it could be fixed.

4 I've bought some spare covers, but not yet used the. Does anyone have any luck with materials to get rid of scratches on their top covers?

5 Notwithstanding the odd niggle, it's a great device which aroused a lot of interest and some envy amongst fellow walkers.
Back to top
View user's profile Send private message
BigPerk
Frequent Visitor


Joined: Sep 06, 2006
Posts: 1618
Location: East Hertfordshire

PostPosted: Sun May 03, 2009 6:45 pm    Post subject: Reply with quote

Re (4) - thread "Scratched screen" may be of interest. I think there may be other relevant threads if you want to do a search.
_________________
David
(Navigon 70 Live, Nuvi 360)
Back to top
View user's profile Send private message
mikealder
Pocket GPS Moderator
Pocket GPS Moderator


Joined: Jan 14, 2005
Posts: 19638
Location: Blackpool , Lancs

PostPosted: Sun May 03, 2009 7:52 pm    Post subject: Reply with quote

Toothpaste or Duraglit silver polish can be used to polish out smaller scratches, if you manage to make a real mess of the outer shield screen it is replaceable - Three screens cost around £15 IIRC - Mike
Back to top
View user's profile Send private message Send e-mail MSN Messenger
goon525
Regular Visitor


Joined: Aug 25, 2005
Posts: 75

PostPosted: Sun May 03, 2009 9:21 pm    Post subject: Reply with quote

Thanks, Mike. I've bought the set of three replacements but am quite keen to get a bit more use out of my first one first! Paid a bit less - around £12 at Amazon. I'll try the toothpaste idea - suspect Duraglit would cost me as much as a new screen. Thanks also to BigPerk.
Back to top
View user's profile Send private message
4ndynorfolk
Regular Visitor


Joined: Jul 02, 2008
Posts: 237
Location: Norfolk

PostPosted: Sun May 03, 2009 9:55 pm    Post subject: Reply with quote

I have had success with DISPLEX mobile phone polish. I have used it for a number of years on mobiles and other lcd displays.

I had to order some more this weekend. Mobilefun have free p&p this weekend.
Back to top
View user's profile Send private message
djhpk
Occasional Visitor


Joined: Jan 14, 2008
Posts: 28
Location: High Peak

PostPosted: Mon May 04, 2009 7:19 pm    Post subject: Some observations after intensive use Reply with quote

goon525 said
Quote:
Also as others have experienced, it consistently over-reads the distance walked. I got into a habit of hitting 'Stop' only for the longer lunch-break, not for five or ten minute stops. At the end of walks of between eight and twelve miles, I would say it had over-read by around 7%. Cheap'n'cheerful Garmins did better. Intriguingly, turning the track into a route at the end left one with pretty much a spot-on result.


I beg to differ. If you put a track file from the Active 10 into Memory Map and check the track length you will find that it it agrees almost exactly with that given on the Active 10 itself. If you then convert the track to a route with Memory Map, you will find that the route length is reduced just as it is when you carry out the same operation on the Active 10.

This reduction is simply a consequence of using less data points to define the shape of a "wiggly" line. The more data points that you have, the more accurate the length estimate will be (unless all the data points are on a great circle).

So, the question is "why is the Garmin under recording the track length?" and the answer is probably that it is not recording track data points as frquently as the Active 10!
Back to top
View user's profile Send private message
goon525
Regular Visitor


Joined: Aug 25, 2005
Posts: 75

PostPosted: Mon May 04, 2009 8:12 pm    Post subject: Reply with quote

Sorry, but I can see the Satmap adding distance when I am standing absolutely still. As I said, the value of this over a longish walk seems to be about 7%, though I can't prove this scientifically. I'd be interested to walk a measured mile somewhere with it on, though!
My conjecture is that the effect of this over-reading roughly equals the 'cutting corners' under-reading when you turn a trail into a route. Two opposite errors are roughly cancelling each other out.
Back to top
View user's profile Send private message
philpugh
Lifetime Member


Joined: Dec 28, 2005
Posts: 2003
Location: Antrobus, Cheshire

PostPosted: Tue May 05, 2009 2:10 pm    Post subject: Reply with quote

goon525 wrote:
Sorry, but I can see the Satmap adding distance when I am standing absolutely still. As I said, the value of this over a longish walk seems to be about 7%, though I can't prove this scientifically.


There is always a little 'wandering' when stationary with GPS receivers. The better the fix (ie more sats and good spread over the sky) the less this will be. Unfortunately this does affect walking more than cycling/driving/flying in that order as the distance of the wandering is usually quite small (possibly a couple of metres each log interval but often less). If you are stopping for a significant time (eg lunch) then it is probably best to stop logging - but short stops (or "view breaks" as we older walkers call them Laughing ) shouldn't be too troublesome.

Now I'm prepared to be shouted down here but I believe that most GPS units calculate distance in 2D - that is they don't take into account ascents/descents - but that is the same if you measure the distance on an OS map with one of those little wheel thingies (they must have a name but I have forgotten it). So a walk with a lot of steep ascent/descent will be under measured for distance over the ground for those sections. If GPS units do take into account changes in height then there is a bigger problem - their altitude accuracy is appaling and would render distance calculations irrelevant.
_________________
Phil
Back to top
View user's profile Send private message
Not_lost_yet
Occasional Visitor


Joined: Apr 26, 2009
Posts: 16
Location: Nottingham UK

PostPosted: Tue May 05, 2009 2:37 pm    Post subject: Reply with quote

4ndynorfolk wrote:
I have had success with DISPLEX mobile phone polish. I have used it for a number of years on mobiles and other lcd displays.

I had to order some more this weekend. Mobilefun have free p&p this weekend.


Based on this post I have done the same whilst P&P is free. Thanks for the info Smile
Back to top
View user's profile Send private message
cosmiccowboy
Occasional Visitor


Joined: May 20, 2008
Posts: 22

PostPosted: Wed May 06, 2009 11:52 am    Post subject: Reply with quote

Not_lost_yet wrote:
4ndynorfolk wrote:
I have had success with DISPLEX mobile phone polish. I have used it for a number of years on mobiles and other lcd displays.

I had to order some more this weekend. Mobilefun have free p&p this weekend.


Based on this post I have done the same whilst P&P is free. Thanks for the info Smile



Ditto.

I hope you're on commision.

Thank you.

cosmic
Back to top
View user's profile Send private message







Posted: Today    Post subject: Pocket GPS Advertising

Back to top
Display posts from previous:   
Post new topic   Reply to topic    Pocket GPS World Forum Index -> Satmap Active 10 All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Make a Donation



CamerAlert Database

Click here for the PocketGPSWorld.com Speed Camera Database

Download Speed Camera Database
22.043 (17 Apr 24)



WORLDWIDE SPEED CAMERA SPOTTERS WANTED!

Click here to submit camera positions to the PocketGPSWorld.com Speed Camera Database


12mth Subscriber memberships awarded every week for verified new camera reports!

Submit Speed Camera Locations Now


CamerAlert Apps



iOS QR Code






Android QR Code







© Terms & Privacy


GPS Shopping