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Garmin eTrex GPS receiver Review

04th March 2003

 Reviewed by Mike Barrett

  

Garmin GPS receivers

 

What do you get?
The Garmin eTrex receiver is priced at around £114.49 including VAT (GPS Warehouse) and comes complete with a quick reference guide, a full manual, and a wrist strap.

You will need a pair of AA sized batteries to run the GPS receiver which are not included in the package. It is possible to use rechargeable batteries, but normal alkaline batteries are recommended.

To connect the eTrex to a PC you will need a PC Interface cable. The Garmin cable costs about £30.

 

The cable set used connecting the eTrex to the Pocket PC was provided by PC-Mobile and comes in a number of modular cables which can be set into a number of configurations so you can by a new adapter for another Pocket PC without having to by a complete lead set.

The review unit was kindly lent to us by GPS Warehouse. This was used in conjunction with Garmin eTrail and the PC and PDA applications Autoroute, Fugawi, Memory-Map, OziExplorer, Tom Tom Navigator.

The Garmin eTrex GPS receiver

 

Garmin eTrex Specification
The manufacturer's specification are quoted here.

 

Navigation Features
- Waypoints/Icons: 500 with name and graphic symbol

- Tracks: Automatic track log; 10 saved tracks let you retrace your path in both directions

- Routes: 1 reversible route with up to 50 waypoints

- Trip computer: Current speed, average speed, time of sunrise/sunset, resetable maximum speed, trip timer, and trip distance

- Map datums: More than 100

- Position format: Lat/Lon, UTM/UPS, Maidenhead, MGRS, Loran TDs, and other grids

 

GPS Performance
- Receiver: differential-ready, 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites to compute and update your position

Acquisition Times:
- Warm: approx. 15 seconds
- Cold: approx. 45 seconds
- AutoLocate™: approx. 5 minutes
- Update Rate: 1 second, continuous
 
GPS Accuracy:
- Position: <15 meters, (49 feet) RMS
- Velocity: 0.1 knot RMS steady state
 
 

Dynamics: 6g's
Interfaces: RS232 with NMEA 0183, RTCM 104 DGPS data format and proprietary GARMIN
Antenna: Built-in patch

Physical
- Size: 4.4"H x 2.0"W x 1.2"D (11.2 x 5.1 x 3.0 cm)
- Weight: 5.3 ounces (150 g) with batteries
- Display: 2.1"H x 1.1"W (5.4 x 2.7 cm) high-contrast LCD with bright backlighting
- Case: Waterproof to IEC 529 IPX7 standards
- Temperature range: 5°F to 158°F (-15°C to 70°C)
- Data storage: Indefinite; no memory battery required

Power
- Source: 2 AA batteries (not included)
- Battery Life: Up to 22 hours

 

The Garmin eTrex Receiver

The Garmin eTrex GPS receiver

Dave reviewed the Garmin eTrex Vista receiver a month ago. The Vista is the top model of the eTrex range. I was interested in seeing if the bottom of the range was capable of replacing a GPS sleeve for the PDA and still provide a versatile multifunction capability.

All the eTrex models are the same size and the cases are very similar, varying only in the colour. They are really small, about the size of your palm.

There is a lot of black rubber on the receiver. Not only does this make it waterproof, and float it also makes it stick to the dashboard on your car.

The display is a four level gray LCD screen with backlight.  It has a resolution screen of 128 by 64 pixels which is less than both the eTrex Vista and the Garmin GPSMap76, however as the GPS receiver does not support the display of maps it is not an issue.

The Garmin eTrex GPS receiver

The Garmin eTrex comms connectorThe black tongue at the top on the back protects the electrical communications connectors. This is where the interface cable is plugged in. The four connectors are for data in, data out, ground and power. Both the Garmin PC Interface and the PC-Mobile modular PDA cables fit in this socket.

The specifications above state that the receiver is differential-ready. DGPS can only be achieved with the addition of an external beacon receiver. DGPS (in the form of WAAS or EGNOS) is not built into this device.

The battery compartment is situated on the back and comprises of 2xAA batteries.  Although you could put rechargeable NiCad or NiMh batteries in there, the eTrex tends to prefer alkaline batteries. The Garmin specification for minimum voltage is 2.5 volts, rechargeable batteries supply 2.4 volts as opposed to 3 volts supplied by alkaline ones.

The left side of the Garmin eTrexOn the right hand side of the eTrex are two buttons. The lower one is the power button which also doubles up as the backlight button. The top button is used to page through the various screens on the receiver.

The Garmin eTrex left hand side control buttons.The left hand side of the eTrex contains the remainder of the controlling buttons. The top two move the cursor or selection up and down, whilst the lower button is the enter button.

The operation of these buttons has been designed for single handed operation. Having said that I am left handed and found it much easier to work using both hands. That said I let a few right hookers use it and they had no problems.

Overall the GPS receiver felt well constructed. All the moveable components fitted correctly and felt right in my hand. The device is marginally longer than the palm of my hand and about half the width. The weight felt about right to. About the same as my Nokia 6310i phone. Not light weight and plastic, but solid and not too heavy.

 

GPS Satellite Fixing
I think I have been spoilt with my experiences of using GPS receivers. I started with the NavMan sleeve, but my second receiver was the Garmin GPSMap76, closely followed by the Emtac BT GPS both of which are excellent GPS receivers, and was expecting the same sort of abilities from the eTrex. Unfortunately that was not the case, not that the eTrex was bad but it did not fix either as quickly or hold it's fix as well as the other two units. After being turned off for a few days the eTrex still managed to get a fix in 39 seconds.

Interestingly my experiences with TTFF seem to be somewhat better then Dave's which is strange as they both use the same hardware. I did find that the receiver did fix faster if held horizontally rather than vertically, which is the natural way to hold it.

There are two different displays available for the tracking display: a graphical image and a traditional sky view. Shown below are the four screens associated with the GPS satellite fixing. The first one is the "normal skyview" this shows graphically four satellites in the sky, when a satellite is being tracked but has not been fixed yet a dashed line flickers between the person and the satellite. When it is fixed a solid line is displayed as shown below. When 3 satellites have been fixed positional data will be available with a 2D fix, when all 4 are connected then you will have a 3D fix.

Tracking satellites with the Garmin eTrexThe Garmin eTrex skyview optionsThe Garmin eTrex skyview.No signal on the Garmin eTrex

The screen can be changed by pressing the lower left (enter) button. This displays a menu which allows you to select from the various options by using the upper two left hand buttons to highlight your selection, then pressing enter again to confirm the selection.

The traditional satellite screen shows up to 12 satellites that it knows are in the sky, and identifies which ones have complete ephemeris data for and which one's its currently getting this from.

The English Lake District.The eTrex's ability to hold a fix once obtained was quite reasonable. Again not up to the standard of the Garmin GPSMap76 or Emtac BTGPS, but far better than any of the iPaq GPS sleeves that I have used.

Having said that I was up in the Lake District in Cumbria a couple of weeks ago. We had some horrible weather as can be seen in the photo on the left. During this walk the Garmin eTrex lost it's fix a few times whereas the Emtac BT GPS did not.

Both receivers were in a backpack, with the Emtac actually inside a waterproof otterbox, so both had exactly the same environmental influences.

 

Map Displays
The Garmin eTrex track and route display.Map display is not really the correct term for this display but this is the one that shows your track and route in a graphical screen. What you actually see on this display is your current position and where you have been. If there are any waypoints or the route encompassed in the current display area then these will be shown as well.

The picture on the right shows the track and a "?". The question mark is displayed flashing when there is no GPS fix. Otherwise a small man is shown. When you are moving the man will walk leaving the tracked marked behind. The scale of the display can be modified by pressing the upper left buttons. This scale goes from 200 feet all the way to 800 miles.

The map display can be configured in a number of ways. Pressing the enter button displays the menu shown to the left. From here you can configure the display to:The Garmin eTrex map options.

  • be North up or course up,
  • you can have autozoom enabled to show your entire route automatically,
  • you can show or hide the waypoints on the display,
  • you can show the bearing line or course line of travel,
  • and if you are currently navigating you can stop navigating on the route

 

The Pointer Page

The Garmin eTrex pointer page.The position options pageThe various displays on the eTrex are referred to as pages. The pointer page has three functional areas: Navigation section; Compass and direction data; and Information area.

When navigating along a route the next waypoint in the route is displayed along with distance and estimated time of arrival. Underneath this will be the pointer. When the pointer is pointing straight up you are heading in the correct direction.

At the bottom of the display is the information panel. This can display 11 types of data including your position in a number of different formats, your speed, average speed, trip time etc. The different data types can be changed by using the upper left scrolling buttons.

Pressing the enter button will show the pointer options display. From here you can reset trip details or stop navigating.

eTrex Menu Page

The eTrex system management menuThe menu page is where you control the features of the eTrex receiver. It has the following functions available:

  • Mark - Create a new waypoint
  • Manage the list of waypoints
  • Manage the route
  • Manage tracks
  • Set the operational parameters of the receiver.


Mark Waypoint

Selecting the mark waypoint option will display the screen to the far left. You can change the icon associated with the waypoint and also edit the name by scrolling the highlight and pressing the enter button.

Changing the icon is not a problem, just a matter of scrolling down the list of options and pressing enter. Editing the name is a different matter altogether. For each letter you need to scroll through the list pressing enter when you find the right one.

To save the waypoint press enter when OK is highlighted.


Manage Waypoints

The waypoint selection screen Review your waypointThe eTrex can store up to 500 waypoints. This can be a nightmare to manage if you are not careful how they are named. The management is achieved through selection of the waypoint via the screen shown on the far left. You can also find the nearest waypoint, or delete all of the stored waypoints.

Having selected your waypoint the review waypoint display is shown. This allows you to navigate to the waypoint, using GOTO; display the waypoint on the Map Page, delete the waypoint, or create a new waypoint a specific distance and bearing from the current position.


Manage Routes
The Garmin eTrex route management displayThe eTrex only supports a single route. This can be created or edited by selecting the location where you want to add a waypoint and then pressing the enter button. This will then show the waypoint selection screen as shown above left.

When the route is complete you can navigate along it using the FOLLOW button. This will activate the route and you will see it highlighted in the other pages already described.


Manage Tracks

The Garmin eTrex track log page The track log screen allows you to manage the tracks in you GPS receiver. You can have up to 10 tracks stored in the eTrex. The current track is named the ACTIVELOG. When you select to save the tracklog you will be prompted to save the entire log, or through a number of displayed times. Saving the track will not remove it from the activelog. You will also need to clear the track log.

When saving the track a default name is selected. You will also have the option to rename the tracklog.

The eTrex has a feature known as TracBack which allows you to retrace your steps by navigating in reverse along the recorded track. This is activated by selecting a track, pressing the enter button and then highlighting TRACBAK.


Setup
The final section of the menu is the setup. This section allows the setting of date and time options, along with the display settings. The most important options though are the those shown below: The display and selection of the units, here you can select a number of options I have selected British Grid which gives me the position in Ordnance Survey co-ordinates. The last display is the interface options which define how the eTrex will communicate with connected equipment.

 

 

Connecting the eTrex to a Pocket PC
This can be done very easily with a cable set supplied from PC-Mobile.  All you need to do is set the Garmin eTrex interface to NMEA In/NMEA Out, and connect it up to your Pocket PC and use any GPS package set to COM1 and NMEA 4800 and you should start receiving the NMEA data stream.

 

I have used this configuration successfully with Tom Tom Navigator, OziExplorer, Memory-Map and Fugawi

However with applications like OziExplorerCE and Memory-Map if the interface is set to GARMIN then the receiver can upload and download information for management within the PDA. This becomes critical if you want to have a route with more than 50 waypoints or have more then one route.

 

Connecting the eTrex to a PC

Once again the Garmin eTrex can be connected to a PC. Why would you want to connect your GPS to a static PC? Well this is really for 2 reasons: Firstly the PC does not have to be static, you could be running on a laptop; secondly using various software packages you can manage the waypoints, routes, and tracks.

Connecting to a laptop. I have a 12v converter to power my laptop from the cigarette lighter in my car. This gives me a fully powered and mobile PC. I have connected the Garmin eTrex to the laptop and, running Autoroute, plotted out my current position along the route. This setup worked well, but the laptop could only realistically be used by a passenger, also the software is not up to the standard of the PDA GPS navigation packages.

Connecting to a static PC I was able to integrate the eTrex with Fugawi, Memory-Map, and OziExplorer to manage tracks, routes and waypoints. I currently reviewing Garmin's eTrail software. This connects to the eTrex, and I can then load the data back into one of my management applications. This will be described in more detail later.

 

Strengths and Weaknesses
The unit tested is one of the world's popular GPS receivers and priced at just over £100 compares very favourably in price to sleeve and Compact Flash GPS Receivers.

 

Where the receiver really scores is in the fact that it is a stand-alone unit which can last up to 22 hours on a set of batteries, far longer than a PDA. This means that you can use the GPS for extended periods recording track data, and use a PDA only occasionally when you need to look at a moving map. You could even take the receiver on an plane and once electronic gadgets are useable you can record your flight track, downloading to your PC or PDA when you touch down.

A big advantage over GPS sleeves and CF receivers is the TTFF and the receivers ability to retain the fix even in adverse conditions. It is not as good as the Emtac BTGPS or Garmin GPSMap76 but is about 1/3 the price of those units.

Where I did find it less than useful was when changing routes due to adverse conditions. Normally I would build escape routes for a walk which I could switch to as required. With the capability to store just a single route switching route requires access to a PDA or computer. Not very practical on a mountain when you need to make quick and reasoned decisions. This proves the point of retaining and refreshing traditional navigational skills. Yes I did have a paper map and compass. The eTrex was still useful to pinpoint our location as I could read out the current position in OS co-ordinates.

Purchase from

 

 

Conclusion

Manufacturers Website

http://www.garmin.com 

Suppliers Website http://www.gpsw.co.uk
http://www.pc-mobile.net

Pocket GPS Reviewer

Mike Barrett

Pocket GPS Reviewer Website

http://www.1st-financial-leads.co.uk

Rating

 

Construction

Useability

Robustness

Overall Rating 90%

How did we achieve these ratings ?

Review Ratings

   

 

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