Canada's Capital Cachers / Cacheurs de la capitale du Canada

Tech Talk => GPSr Units => Garmin => Topic started by: BigMandDJ on July 24, 2012, 08:45:26

Title: Oregon 450t projections
Post by: BigMandDJ on July 24, 2012, 08:45:26
DJ and I have a relatively new Oregon 450t. Recently needed to make a bearing projection of 58.3 degrees but seem only to be able to project with even numbers only! I have made a cursory search through here, G.com and Google---but no luck to see if decimals can be worked in. Will try converting to Mils, but again, no decimals--though I presume a 'closer' projection. Any other tips would be welcomed. Pitiful manual, we had to research on line just to find out how to delete files. (So much still to learn!)
Title: Re: Oregon 450t projections
Post by: portera on July 24, 2012, 08:48:42
I think you're out of luck with the decimal degrees, but mils will work. As for the manual, I completely agree. it is completely useless. I use this site as my manual. Garmin Oregon Wiki (http://garminoregon.wikispaces.com/).

I think it is unacceptable for Garmin to provide such crappy documentation.
Title: Re: Oregon 450t projections
Post by: CocaColaCacher on July 24, 2012, 08:51:11
I usually just round to the nearest whole number.  Unless you are projecting a huge distance being of a decimal fraction on a close projection shouldn't cause much of an error, especially for geocaching where you are dealing with a +/- of up to 10m when looking for a cache/waypoint anyways.
Title: Re: Oregon 450t projections
Post by: BigMandDJ on July 24, 2012, 09:01:25
Thanks for the quick responsses and Wiki page tip. We may be back or more.
Title: Re: Oregon 450t projections
Post by: The red-haired witch on July 25, 2012, 09:18:20
As a quick check if you're in the field and unsure of how big an error rounding the degrees will give, I recommand doing a projection witht the two nearest whole numbers.  So, in your example, a projection with 58 degrees and a projection with 59 degrees.  If the resulting waypoints are close enough together, it gives you a line to search in between.  If they are far apart, you'll know it's worth doing the projection on a computer with geocalc or a similar tool...
Title: Re: Oregon 450t projections
Post by: BigMandDJ on July 25, 2012, 11:49:52
Thanks red-haired witch. Didn't think of 'making a line'! Also, just came across another reference to the geocalc and will see what's up with that. Need all the tools we can get! Great help here.