I have had this GPS for a number of years now. It was originally bought from ebay, so there it returns! It is a rugged servicable unit. I use a TomTom now, so have no need of this item and a map to tell me where I am!
It is quite a conveinient unit as it takes standard AA batteries.
It is pretty much waterproof having been designed with the marine user in mind.
I've used this for walking around the welsh hills.
There is a lot of free software available I believe.
The manual can be found
here.
Receiver: 12 parallel-channel technology, tracks up to 12 satellites to compute and update information with quadrifilar antenna
Acquisition Times (under optimal conditions):
Warm: 1 minute
Cold: 15 secs
Update Rate: 1 sec continuous
Accuracy:
Position: 49 feet (15 meters) RMS (with Selective Availability turned off)
Velocity: 0.1 knot RMS steady state (with Selective Availability turned off)
Limits:
Speed: 951 mph
Altitude: 17,500 meters
Size: 6.2”x2.0”x1.3”[h]x[w] x[d] (15.75 cm x 5.08 cm x 3.30 cm)
Weight: 7 ounces (198.45 grams) with 2 AA batteries installed
Display: 2.2” x 1.33” [h] x [w] 5.59 cm x 3.38 cm
high contrast LCD with EL backlit display
Housing: Waterproof (Battery compartment is splashproof)
Operating: 14 ̊F to 140 ̊F to (-10 ̊C to 60 ̊C)
Storage: -40 ̊F to 167 ̊F (-40 ̊C to 75 ̊C)
Power:
Source: 2 AA alkaline or lithium batteries or 9-16 VDC with power cable
Battery Life: Up to 15 hours
) 
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