GPSR Altitude

11:33 a.m. on January 5, 2002 (EST)

Garmin Etrex questions.

Altitude. As near as I can figure from the manual, the unit does not use GPS to calculate altitude but uses barometric pressure. Have I misread the literature? Or does it use both?

Are their costal marine charts available for it?

Can it output realtime readings to a laptop for use in Marine navigation?

11:45 a.m. on January 5, 2002 (EST)
(Guest)

also try alt.satellite.gps for lots of answers

8:27 p.m. on January 5, 2002 (EST)
(Guest)

a.k.a. Don M, Don Morris, Don P. Morris

Quote:

Garmin Etrex questions.

Altitude. As near as I can figure from the manual, the unit does not use GPS to calculate altitude but uses barometric pressure. Have I misread the literature? Or does it use both?

Are their costal marine charts available for it?

Can it output realtime readings to a laptop for use in Marine navigation?

Which Etrex model do you have? There are several in the Garmin catalog, including one designed for narine use. I have the plain vanilla, bottom of the line, plain Jame Etrex, which does not have a barometer. Doesn't need one either. I believe the Etrex Summit, at about double the price, includes an aneroid barometer as well as several other bells and whistles.

Garmin sells accessory cables which will connect all of their Etrex line to computers for real time display of coordinates. Even the bottom of the line Etrex can display on a computer - very capably.

12:54 a.m. on January 6, 2002 (EST)

I have the etrex Vista.

I have the topo map software which I mistakenly downloaded over the top of the streetmap software which came with it and it now seems to be lost. Any way to get it back?

I still can't find out about the altitude. From what I read on this web site if you had both the gps altitude and barometric, you could have a good predictor of the weather given the current accuracy of gps altitude. Any way to find out?

Finally, I'd like to have detailed street mapping software since I trave a lot and could use it though I never thought I would. Does the software sold by Garmin work well for finding directions from A to B?

Also, I've not seen any literature about how to hook the Garmin to a laptop though I have the cable which downloads the data from a PC. I should have purchased the cable that allows DC input as well as PC connection is it still available? And, how does one go about getting the current location heading and speed info to show on the pc?

Quote:

Quote:

Garmin Etrex questions.

Altitude. As near as I can figure from the manual, the unit does not use GPS to calculate altitude but uses barometric pressure. Have I misread the literature? Or does it use both?

Are their costal marine charts available for it?

Can it output realtime readings to a laptop for use in Marine navigation?

Which Etrex model do you have? There are several in the Garmin catalog, including one designed for narine use. I have the plain vanilla, bottom of the line, plain Jame Etrex, which does not have a barometer. Doesn't need one either. I believe the Etrex Summit, at about double the price, includes an aneroid barometer as well as several other bells and whistles.

Garmin sells accessory cables which will connect all of their Etrex line to computers for real time display of coordinates. Even the bottom of the line Etrex can display on a computer - very capably.

1:36 p.m. on January 6, 2002 (EST)
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eTrex

You have a lot of questions. The best source for your answers is to go to Joe and Jack's website joe.mehaffey.com They have several specific articles on the eTrex models.

If you go to the map page, bring up the first menu, you will see something called "MapSource Info". Select that and it shows the maps currently loaded. You can remove the loaded maps and you will be back to the base map, as you are requesting. You can also do it with your MapSource program (by the way, you say you haven't connected to a PC, so how on Earth did you get the topo map loaded in? Or maybe you are saying you have connected to a desktop, but not a laptop).

You will need both the topo and street software (called MapSource) from Garmin to load into Garmin's mapping GPSRs. When you use the appropriate MapSource, the detailed maps overwrite the previous detailed maps. You can readily go back and forth. It is possible to have both topo and street maps at the same time, but you have to switch between maps in the GPSR itself - you can't display both at once.

Making a big assumption here - you have a cable that connects to a desktop PC (the way you loaded the topo maps?????) The same cable connects to the laptop. You just plug into the back of the GPSR and the serial port on the laptop. Load appropriate software in the laptop (for example, National Geographic's Topo for topographic maps or Delorme's Street Atlas for street maps), bring up the software and follow the directions for linking the GPSR. Click on "track present position" (or whatever the particular software calls it, slightly different for each package). The map will automatically track on your PC's screen.

Your only problem will be battery life. If you get the data/power cable (yes, still sold, either direct or from REI, EMS, West Marine, or dozens of other places), that will take care of the GPSR's batteries. You will need an inverter for the laptop (e.g., Radio Shack, Best Buy, Circuit City, Fry's, many others). And this means you probably need a multi-outlet extension for your cigar lighter. But please, do not try to drive and use the laptop at the same time.

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