Choosing a Recreational GPS Unit
This article is a look at some things to consider when buying a
GPS. The focus is GPS for outdoor recreational (or commercial)
activities. All the examples are Garmin units, as this company's
products are by far the most popular in New Zealand. In this article we mention
specific GPS units as examples. Use these as points of reference. Keep in mind
that new models are appearing constantly and units not mentioned here may suit
When choosing technology, the path to success is starting with a clear idea of what you want to do.
There is probably no perfect GPS for you. There is going to
be a combination of features that you want that no GPS satisfies.
Garmin Colorado, Oregon and GPSMAP 60CSx
What do you want it for?
- Tramping & Hunting. You want a small, robust, light, waterproof unit with good battery life.
Units that can display topomaps and street maps are very popular, but the non-mapping models
are cheaper. There are also specialised hunting models
that have GPS collars for your dogs so you can track their location.
Geocaching. Models like the Garmin Colorado or Oregon models, with built-in paper-less geocaching
features will probably appeal. Though any outdoor GPS can be used.
- Street driving & 4WD. Vehicle navigation models feature large screens and touch-screen controls.
These units are usually not waterproof or drop-proof. On foot, they are suitable for urban navigation.
Unless they are ruggedised, they
are not recommended for tramping. If you mostly want it for driving, 4WD, a waterproof unit like the
Garmin Nuvi 500
might be a good compromise. Take a close look at the features though. You can load waypoints into most
vehicle units, but many of them don't record tracks for later download. Also most of the
vehcile units don't allow you to upload a track from you rPC into the units.
Biking. There are specialised biking units with cadence and heart-rate sensors and training features.
For mountain biking any outdoor unit will probably do fine. Many units have a handle-bar mount as
an accessory - keep in mind these expose the GPS to a fair amount of vibration.
Use with a computer for real-time tracking. The GPS choice depends on the software being used
on the computer. Most
software will support NMEA protocol. NMEA protocol is used by most serial port, USB "mouse" style and
Bluetooth GPS units. Look for units with high-sensitivity receivers
like the SiRF-III chipset. Bluetooth GPS's are conveniently wireless, but USB and serial GPS units
are less fiddly to set up and use. Some software, like our own
MapToaster Topo/NZ also supports
the proprietary Garmin protocol used by their outdoor units.
You'll probably have a mix of these activities, but the primary use will push your choice to one
particular category of device.
Once you have decided how you want to use your GPS, build a checklist of
features. Here are a few things to consider:
Sensitivity. If you plan on using the GPS under tree canopy or in a car in areas
with tall buildings, you will want a GPS with a high-sensitivity GPS chipset. SiRF-III is
a common chipset, but there are others. Pretty much all the units available now will
have high-sensitivity GPS chipsets and at least 12-channel receiver, but you should check the
specfications. The cheapest GPS units often don't have high-sensitivity receivers - we don't
recommend these unless you're on a tight budget.
- Mapping capability. Having topomaps and street maps showing on the
GPS makes navigation much easier.
- Storage for maps. Does the GPS have a slot for an external memory card? If you want to load topomaps
on the unit, you will need the ability to load maps on a microSD or SD card. Some GPS units
have only limited built-in memory. Topomaps require a lot of storage, so limited memory and no microSD means
that you will ony be able to load maps from part of New Zealand at a time,
e.g. load the maps for a particular tramp.
- Voice prompts. Some vehicle navigation units feature spoken prompts to guide you through your
route. Most of the Garmin outdoor units can provide street navigation, but only provide on-screen
directions and beep when you approach a turn.
- Bluetooth hands-free. Many of the vehicle navigation GPS units have Bluetooth. This
allows you to connect the GPS to your cellphone and use it as the microphone and speaker for
hand-free calls. Many vehicle navigation maps have built-in business directories and you can
use the bluetooth connection to dial the call to the business, from your GPS.
- Car/bike mounts. Does the model have the mounting accessories that you need?
External antenna connector. If you are using the unit in a boat or vehicle you may want
to be able to connect an external antenna.
External power connection. In a vehicle you'll want to be
able to run the GPS with the screen backlight on continuously. An external power
connector is essential for this as internal batteries wont last long.
Waterproof. If you're going tramping, you need a waterproof GPS. We sometimes get asked about
using a vehicle navigation GPS or smartphone for outdoor navigation. While putting it in
an Otterbox will keep it dry, it will
be hard to use. If you rely on a plastic bag or
pack to keep one of these devices dry, sooner or later it will end in tears.
- Screen. Big enough/easy to read, backlight brightness. Check in bright sun. Bigger screens are desirable
for vehicle navigation.
- Internal compass and altitude sensor. A basic GPS unit can only show direction when
when you are moving. Some GPS units also have an electronic compass and can display direction
when stationary. Also a barometric sensor provides more accurate altitude tracking. They cost a
bit more, but we think it's worth it.
- Battery life. Battery life can vary a great deal depending on the model and how you
use it. In terms of weight, you need to think about the battery life and the number of
spare batteries you'll need for a typical trip.
- Do I need to buy maps as well? Street navigation units are usually sold with
New Zealad maps included. Maps are typically an extra for outdoor units. When buying topomaps,
you should buy them on CDROM, rather than on microSD card, as you will need a CDROM versions
to load maps from multiple sources at the same time, e.g. topomaps, street maps and marine maps.
- Size and weight. There's not a lot of variation in weight in the outdoor units. The ones
in our list below are all between 150 and 260 grams.
- Coordinate systems. For outdoor use in New Zealand, your unit should support
three coordinate systems: NZ Map Grid, NZ Transverse Mercator and WGS-84 lat/long. NZ Map Grid
is used for the the NZMS260 and other topographical maps. The coordinate system for general
mapping is being changed to NZ Transverse Mercator and from Sep 2009, this will be the coordinate
system for printed topomaps.
- Track recording. Handheld GPS units can usually record your track. There are many options for
how frequently you can save your position. The GPS also has limited storage for track data. Most of the GPS
Garmin units have a limit of 10,000 track points. If you're away for a week or two and don't have
the opportunity to download tracks to a computer this may not be enough. The eTrex and GPSMap 60
series GPS uits can archive up to 20 tracks to save storage, but the date/time information is lost during
archiving and the track points are thinned. If detailed track recording for an extended period of
time is important, take a look at the Garmin Oregon and Colorado models. They have automatic archiving
and the archives are preserve the timestamps and all the track points.
- Price. Obviously a factor. One way to simplify the bewildering array of GPS choices
is to start with a price range and then see if you can find a model that meets your needs. Don't
forget to factor in the cost of the topomaps, street or marine maps that you may want.
The following are a few suggestions from the Garmin range for outdoor use. They cover the range from the most basic non-mapping
to the most capable mapping units. The list is confined to high-sensitivity models. The battery life figures
are taken from Garmin specs - remember that actual battery life may vary depending on the type of battery
and various GPS settings. The prices are typical street prices in NZ dollars at the time of writing.
|eTrex Legend HCx
|eTrex Vista HCx
The Garmin Oregon series outdoor
units have larger screens and
would be a good compromise for in-vehicle and tramping use. The
Garmin GPSMAP 60
and Garmin GPSMAP 62
series could have smaller screens, but are probably better suited to heavy-duty outdoor use.
For in-vehicle use, any of the Garmin Nuvi units should be considered.
Navman and Tom Tom are also popular.
Garmin Nuvi 500 and Oregon GPS
Finally, Google is a great resource of reviews and opnions on specific models.
GPS units can fail. They can get dropped, drowned or lost and batteries go flat. If you're
in steep country under a dense tree canopy the GPS may not get a lock. So if you plan to
use the GPS for navigation in the wilderness, you should also take a paper maps and a compass
as a backup and know how to use them.
Copyright © 2009-2011 Integrated Mapping Ltd. All Rights Reserved.
This article may not be reproduced without permission. Garmin is a trademark of Garmin Corporation.