| Author |
Message |
 Topic: Garmin Oregon 300 |
captain_paranoia
Replies: 76
Views: 55722
|
 Forum: Garmin Handheld GPS Receivers Posted: Fri Jan 23, 2009 6:01 pm Subject: Garmin Oregon 300 |
Had another look at the screenshots on Garmin's websites, and I now notice that the one I looked at in detail just happens to be somewhere where OSGB and WGS84 grid Norths align nicely.
The other i ... |
| Topic: Garmin Oregon 300 |
captain_paranoia
Replies: 76
Views: 55722
|
Forum: Garmin Handheld GPS Receivers Posted: Fri Jan 23, 2009 2:46 pm Subject: Garmin Oregon 300 |
"420MB isn't unreasonable for 1:50k UK mapping"
Oops; need to read posts more carefully... 420MB is for the two NPs at 1:25k and 1:50k. I'd have to think about how much data I'd expect for that. ... |
| Topic: Garmin Oregon 300 |
captain_paranoia
Replies: 76
Views: 55722
|
Forum: Garmin Handheld GPS Receivers Posted: Fri Jan 23, 2009 2:41 pm Subject: Garmin Oregon 300 |
Well, the 'track up' view is interesting; it shows that the unit is re-projecting (well, rotating at least) on the fly.
I was discussing this topic with my colleagues at lunchtime, and we decided t ... |
| Topic: Garmin Oregon 300 |
captain_paranoia
Replies: 76
Views: 55722
|
Forum: Garmin Handheld GPS Receivers Posted: Thu Jan 22, 2009 7:23 pm Subject: Garmin Oregon 300 |
"As for the North Reference selection; try selecting Grid North. "
You need to make sure your unit it set up to use OSGB Grid. But you've probably done that; does it present OSGB grid refs, or Lat ... |
| Topic: Garmin Oregon 300 |
captain_paranoia
Replies: 76
Views: 55722
|
Forum: Garmin Handheld GPS Receivers Posted: Thu Jan 22, 2009 7:22 pm Subject: Garmin Oregon 300 |
"The whole discoverer image on the SD card containg five different map scales comes to 416,144Mb!"
Does the comma indicate a decimal point, is a thousands separator? i.e. is it 417MB or 416GB?
... |
| Topic: Garmin Oregon 300 |
captain_paranoia
Replies: 76
Views: 55722
|
Forum: Garmin Handheld GPS Receivers Posted: Thu Jan 22, 2009 7:09 pm Subject: Garmin Oregon 300 |
"I bet it's aligned to WGS84 grid north !"
Possible, but their appear to show the mapping aligned to OSGB grid. Which I'd suggest is kinda sensible...
I'm afraid I have no experience of using t ... |
| Topic: Garmin Oregon 300 |
captain_paranoia
Replies: 76
Views: 55722
|
Forum: Garmin Handheld GPS Receivers Posted: Thu Jan 22, 2009 2:08 pm Subject: Garmin Oregon 300 |
eyeQue,
More useful images, thanks.
Looks like their software update has addressed a number of zoom scaling algorithm issues I mentioned above; they've put proper resampling filters in to remove ... |
| Topic: Garmin Oregon 300 |
captain_paranoia
Replies: 76
Views: 55722
|
Forum: Garmin Handheld GPS Receivers Posted: Wed Jan 21, 2009 5:49 pm Subject: Over-compressed mapping image data? |
Looking at the images, there seem to be two problems:
i) low quality factor (high compression) JPEG of the mapping images.
ii) poor choice of scaling algorithms resulting in blocky images on wide ... |
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