
This is a great GPS. I bought it because of the large screen size for hiking even
though there are some serious shortcomings for this use.
1) battery life is only 3.5 to 4 hours.
2) the unit cannot be completely turned off unless one removes the battery.
I was aware of these things before I bought it but Garmin does not make
a trail GPS with a large screen. The battery life is definitely a problem.
I have to carry 2 spare batteries(3 total) for a long 11 hour day hike if
I run a continuous track log. One can enhance battery life if one dims the
screen when not reading it. I have also used a NUVI 350 (4 hr battery life)
all day by turning it off(350 can be completely turned off) and turning it on
only for position checks(NUVI 350 does not have a tracklog capability).
The Nuvi 855 can be put in sleep mode to further improve battery life but
the tracklog is not active in sleep mode. Battery life is 7-10 days in sleep mode.
As an automobile GPS the 855 is superb. The lane assist display is helpful as is the speed limit
data display which is quite accurate. The trip log data is very nice showing
both moving average speed and total average speed among others.
Loading maps from a micro SD card is rather slow on a cold start. One can
find free maps at [...] that are quite accurate.
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