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Most people find it hard deciding on what type of GPS system to get.
There are two types; dash mounted and handheld.

Handheld GPS System
It is important to consider what kind of features you need out of a
handheld GPS system before selecting a unit to purchase. Some
portable GPS systems are purely handheld units for use in a wide
variety of outdoor activities such as hiking, boating, and biking. If you
find yourself needing a GPS device for such activities, a handheld
device is what you need. If you find that you need the GPS device
more for use while driving on the road, you may want to look at the
dash-mounted GPS systems. These systems are designed primarily
to remain in the vehicle and used when driving.

Below are a few Pros and Cons of Handheld GPS System when
compared to a dash-mounted system.

PROS
Handheld units are extremely portable, and can be used in a variety
of settings such as hiking, biking, driving, boating, etc
They are available in many shapes and sizes, including ultra-
compact and lightweight pocket size
Most of the handheld units are rugged, highly durable, waterproof,
and shockproof
They can be powered off a cigarette lighter or on batteries (20 hour
battery life is standard)
Optional accessories are easily available that allow for securing the
GPS systems to the windshield or dashboard
Most handhelds do not have a steep learning curve associated with
them. They are user friendly, making them quick and easy to learn
Handheld GPS systems are most popular among hikers, bikers,
and kayakers
They are generally less expensive to acquire than dash-mounted
systems
Due to their small size, handheld GPS systems can be operated
with one hand

CONS
The small screens on the handhelds can be more difficult to read,
especially while driving
The small buttons on handheld systems more difficult for large fingers
to manipulate
Some features boasted by the handheld units (e.g. altimeter,
compass, illuminated screens, mapping features) tend to decrease
battery life
The mapping capabilities of the handheld systems are not as good
as the dedicated dash-mounted systems
Handheld units are typically less sophisticated than dash-mounted
systems
Poorer screen resolution when compared to the larger dash-mounted
systems
Reception of handheld systems tend to be weaker in heavily wooded
areas due to their lower-powered antennas
Handheld systems are less popular for vehicular use due to their
reduced number of features
Most handhelds have no standard swivel mount to rotate the display
screen in your vehicle

It should be noted that the same GPS receivers used for off-road can
also be used to track your movements when walking in strange towns,
hiking through the woods, bicycling, boating, or marking landmarks like
gas stations or favourite restaurants on long road trips. The biggest
disadvantage of handheld GPS systems is their lacklustre mapping
capabilities. Most handheld GPS systems are more suited to
navigational use that does not involved detailed mapping.

Dash-Mounted GPS System
It is important to consider what kind of features you need out of a dash-
mounted system for your vehicle before making the move to purchase
a unit. There are two types of dash-mounted GPS systems:
Those that remain in your vehicle and are used when during driving
GPS systems that can be removed from the car after use, and can
also be used for other activities, such as hiking, biking, or boating
Take the time to decide what you need out of a GPS system before
looking at anything. If you simply have one thing in mind: Getting
yourself from point A to point B when you're driving, then one of the 2
types of aforementioned dash-mounted GPS systems is for you.

Below are a list of Pros and Cons of Dash-Mounted GPS Systems
compared to handheld systems.

PROS
The larger screens on dash-mounted GPS systems are easier to read
at a glance
Some dash-mounted systems have the capability to automatically
recalculate your route if you deviate from the planned route
Larger buttons can be found on these units for ease of operation
while driving
Dash-mounted systems can remain securely in your vehicle following
use
Some dash-mounted GPS systems have the capability of giving
voice instructions that communicate distance, name of streets, and
direction of the next turn automatically
No batteries needed to power these units. The are powered by a 12
volt power source in the car (cigarette lighter)
Most dash-mounted GPS systems have address search capabilities
Better screen resolution due to their larger size and more advanced
features
Some systems contain a personal address book to store locations
for fast and easy lookup
Dash-mounted systems contain superior mapping capabilities
compared to their hand-held versions
Reception tends to be better in heavily wooded areas due to the use
of higher-powered (12 volts for dash-mounted versus ~3 volts for
handheld systems) GPS systems
Dash-mounted systems are most popularly used for vehicles

CONS
Dash-mounted GPS systems are not as portable or easy to remove
from your vehicle for use in other situations such as hiking, boating, etc
The larger size of dash-mounted GPS systems does tend to take up
space in/on the dashboard of the car
These systems are not at all popular with hikers, bikers, and
kayakers due to their size
Dash-mounted GPS systems tend to be more expensive to purchase
than their hand-held counterparts


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