GPSMAP 62S vs. Oregon 400i

I got the 62S for two main reasons. With age, near sightedness is a problem, and it is hard to rely on reading glasses in the woods. So I needed a better display than my Oregon 400i could offer. While the 62S has a lower resolution than the Oregon 400i, that lower resolution seems to make it easier for me to read it, and the brightness of the display is helping too, so that problem (of mine) had been addressed.

The 3-axial compass is easy to calibrate, easier than my Droid Incredible, and once that done, it is a pleasure to use, no more trying to level things out. Beautiful. Compared between the two and my trusted Brunton Eclipse and had the same results, all three compasses indicating magnetic north where it should be.

I tested both units on the road near my house, a complete square shaped circuit, mostly in the open but the south side, especially on the outside of the road comes next to tall trees in full foliage. First time around, I walked on the inside, clockwise. The second time around, I walked on the outside, still clockwise and I reversed the GPS position.
At first, in the open, I noticed both units being very close in numbers, in single numbers even, sometimes just a foot away from each other, well they actually were, as I held one in each hand! But further down the separation grew to six feet, the 62S always being the best. I had WAAS acquisition, quite strong on both units, satellite 48. I lost it for a brief moment on the southern leg on the Oregon, but it came back. Now on the second time around, still on my east leg, I noticed the Oregon becoming less precise, much less so than the 62S. I also noticed the WAAS reception was not so good on the Oregon and it was on satellite 33, whereas the 62 was on 48. I lost WAAS on the southern leg on the Oregon, while I did not on the 62S. Precision went down to about 18ft on the 62S but was double that on the Oregon at nearly 40ft. I was watching the satellite screen all the time on both units.




So how do the track look and compare?



On the left, the Oregon 400i's screen and on the right the 62S.

You can see that the scale is different as going to 120ft did not allow to have the entire picture on the 62S' screen.OTOH, on the Oregon at 200ft the two tracks almost blended, due to the higher resolution, I guess.

I would have been very pleased with either, as they show me on the correct side of the road, and this is not a major thoroughfare, mind you.

Look at the NW corner. On the outside, I had to decide when to cross the street and the way I crossed is better shown on the 62S than on the Oregon 400i. Looking at the SE corner, on the outside, I had to leave the edge of the road as it was overgrown there and the 62S shows it a bit better. Really, I am nit-picking, yet the 62 is the winner!
The maps displayed are not the same. The Oregon has Topo 2008 and NY 1:24000 topo that is displayed, whereas the 62S had the Garmin 1:24000 NE on a uSD card.

I will now put those tracks on an aerial in TopofusionPro and see if the win stays with the 62S.

OK, now we are talking magnification (click on the picture is you need to see it larger) and I see nothing further to add. The two units are darn good, with victory by points to the 62S because it tracked me more accurately in those corners and its WAAS fix was much more stable.

I was tempted to dig up files from the past, but then I remembered that GPS constellation would be different and also the GPS software and firmware would not be the same, thus introducing uncontrolled variables, so I'll stay away from that.

This is a work in progress, I'll add more as I do more. For now both units will accompany me in my forays, but I have a very sound feeling about the 62S. Scott from GPSFix fame told me he had tested the 60csx vs. the 62S and the display of the 62 is at least as good if not better than the 60csx because of the added colors. And his eyes are better than mine, I believe, certainly not as old.

I remembered I had a Gilsson external amplified antenna which I had not used since I got the Oregon. I found it nevertheless and since today is a rainy day, all I want to do is indoors testing. So here are the screens:

Left is with the Gilsson external amplified antenna, right naked 62S, same location, well read the UTM! I am indoors BTW. Location is as correct as I can place it on an enlarged aerial, altitude is right too, the only difference is the GPS precision circle and stronger reception of the satellites in general with the external antenna. Notice that WAAS is working fine (full bar with the external antenna) but I'm not far from a window. IMO, for SAR work, I don't see the need for the external antenna. I'll put it in/on my radio harness, to be used if conditions ever necessitate it, but not as routine use. I also noticed that the MCX connector is quite difficult to detach. I even used needle nose pliers.

Scott (GPSFix/wikis) had trouble transferring tracks adn Geocaches wirelessly. I tried too, from the Oregon 400i to the 62S and although both units indicated transfer completed 100%, I could not access these tracks on the 62S. Now upon checking via computer, I can see those files in the GPX folder! I have just restarted the 62S, still no-go! We may have a minor bug there!

The 62S at its worst!

I left my 62S on by my keyboard at my desk. I don't remember what I did check, but I forgot the unit on for just over an hour. Now my shack and computer are in the basement, facing a wall that is below ground. Behind me are stairs and the living room and only part of a window is visible, double pane glass, window treatment and behind it there is a huge tree in leaf. Most GPS units have no reception here, maybe if I hold them up so they have a better angle at the window and the satellite geometry is just right, but in most cases, I have no reception. Well, I have a track of 148 points, .52 miles long, my 62 being set at marking a point every 5 yards!

So here is the display on the 62S' screen:

And here on TopoFusionPro:

Well I measured the total deviation, north-south was 70 meters and east-west was 50 meters.

Frankly, I've seen much much worse from earlier Garmin units. Why did my 62S do that, simply the signals from the satellite were bouncing all over the place, my below ground wall being just two feet from the 62S, as well as my desktop computer and HF radio and other ham gear. I always like to know how my equipment will function in extreme conditions and although I did no set up this test, the results are interesting and actually, IMO quite good. Tomorrow, I'll leave the 62S in outdoors for a hour and we'll be able to compare results. Satellite geometry will be different but the placement should give it quite an advantage.

OK, so today, I left the OR400i and the 62S on the table on my deck, is good position to acquire satellites for over an hour and a half. Here are the results:

Screen size tell you which is the OR and which the 62S (ok the latter is on the left). Well, both did well, both in a 20ft diameter circle. Length of the "track" was different, maybe due to the extra sensitivity of the 62s' antenna? Now I did not take a screen dump of it but under a more normal working scale like 120, 200, etc. you can't even see that drift on the screen. Now for those of you who are looking for a 35mm film canister (Geocachers), you need to search for it in 314 square feet, a circle that has a radius of 10 feet.

More maps for my Garmin GPS units

I have lately been experimenting with a slew of new maps for Garmin GPS units. The first one I added was the NY State Snowmobile trail map layer http://www.gpssledmaps.com/maps/ny.php . Here are two examples:

The layer is completely transparent and can be seen on top of any map. Snowmobile trails are very twisty and windy and in the field, you never know where they will lead you. Now with this layer, I know and this may be a real factor in some search in the future. Good to have and if distracting, the layer can always be turned off on the GPS.

Topo maps, 1:24ooo were not, so far available as Garmin GPS maps for NY State. No longert true. http://www.gpsfiledepot.com/maps/view/111 Here is a sample and comparison:

While the contour lines are better than ever, and the road data is much more up-to-date, wetlands are missing. But then they are available on Topo 2008, so now I have both layers on my GPS. But you can only access one at a time. So I use whatever gives me what I need most where I currently am walking.

Road maps: Till now you had to shell a good sum for a mapset that was good for use only on a single GPS unit. Well go here http://www.gpsfiledepot.com/maps/view/19/ and get yourself a road map set that is quite good. Some areas are not covered and do not expect turn-by-turn directions, but you can have quite a large area on your 2GB card.

Finally, if you want or need topo maps for Canada, here is a free source: http://www.ibycus.com/ibycustopo/

Not all sets are complete and some are updated every so often, so check each site again from time to time. There are more free maps available for various purposes and locations. But this is just a sample of what is available and what might be useful if you are in NY State or the north east part of the US.

Here are directions on how to switch between maps on your Garmin 60CSx GPS
http://www.miscjunk.org/mj/mp_mapset.html

Here are directions on how to load maps on your GPS:
http://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/

If you don't have a copy of Mapsource, go here:
http://www.gpsfiledepot.com/tutorials/how-to-install-mapsource-if-it-didnt-come-with-your-gps/

Kenwood TM-D700 digipeating my Yaesu VX-8

While I'm very happy with my new Yaesu VX-8, I have noticed that even with an antenna better than the OEM, I rarely get my APRS signal into the local digipeaters. Well, today, that problem got solved. I set my truck's Kenwood TM-D700 to digipeat the VX-8 and it worked perfectly. Yes, I had a little path duplication that is now taken care of, but now the signal flow nicely. Of course, the purists will see a runner going quite faster than humans can, but with today's weather (rain and wet snow), I simply used it from inside the truck.

I now have a working system for SAR or other purposes where my VX-8 signal is digipeated by my truck and can be picked up by my Kenwood TH-D7ag/Garmin CSx at base etc. I can even leave the D7 on its charging stand and not worry about batteries going down.

The next step? Connecting the D7 to my laptop.






I've also noticed that I prefer having the GPS affixed to my radio and not use the remote mike. The package is much more compact without the dangling mike, with the GPS in a place where sooner or later it will get banged hard. In addition, APRS needs to be supervised to look for messages, etc., so I have to look at the display anyhow. For now my VX-8 is configured as in the second picture.


So what can you learn about me through APRS? Well below is a Google map you can access through the links of this blog. It will not always be the same map, depending on where I went and if I turned the system on. But here it is. You may notice that the lines do not do right on the roads. This is simply because they join points taken at two minutes interval, if there was reception and do not show exactly where my truck went. Being a Google map, you can also flick it to the satellite picture, well the real think, not the screen dump I put here.

And finally, you can see the data, mainly the last coordinates, the date and time, first and last heard and the location details.

Try it, either on this blog or on my website.

My new Yaesu VX-8R radio/APRS

This is my new Yaesu VX-8R radio, A small but rugged and waterproof handheld which has a built-in GPS chip in its speaker mike and not only displays my location (in lat/long, WGS 84) on its screen, but can also send it via APRS, to the entire world, given it can reach an internet gate (i-gate).

If its transmissions make it to an i-gate, my position can be checked on several websites including my own K9CHP. Just scroll down to the Where am I page.

But even if I am truly hiking in the boonies, my VX-8R can transmit my position to my truck where it will be kept both on the Kenwood TM-700a mobile radio and the Garmin 60CS GPS. The TM-700a is now out of production and has been replaced by the RC-D710

Another possibility is to use my Kenwood TH-D7AG handheld radio that can be connected to my Garmin 60CSx GPS. This is the seup shown below. I trd using it in the field but the radio is fragile and not waterproof, so you have to protect it a lot and the connecting cable not only tends to get snagged but disconnects quite often, so the entire setup is of questionable field value. But it can be left at base and now they can have a precise idea of my whereabouts and anybody elxe using APRS in that area.

I can also connect the TH-D7AG/60CSx to a laptop and have the locations appear on screen. But the software I use needs internet connection to work at its best, so it won't be functional everywhere. The TH-D7AG is now out of production.





And here you can see how my location looks like on the GPS screen. The blue flag is the last waypoint received. I did change the scale to a large display so the new waypoint will be distinct from the existing ones. But even if it is not clear enough on screen, find waypoints near current location will give the desired results.

I hope to put the system into use in SAR training with Eagle Valley Search Dogs. The nice thing is that the VX-8R can be used by a person without an Amateur Radio licence as it is a simple remote APRS beacon and I will be its control operator. The person carrying it will not have access to any function other than turning the unit off, if so requested on our SAR network.