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Casio GPS watch specifications     from  http://www.casio.com/gps/spec.html (stale)
Accuracy at normal temperature 15 seconds per month

Timekeeping display hour, minute, seconds, am/pm, year, month, day, day of week

Time system  Switchable between 12-hour and 24-hour formats

Calendar system  Full Auto-calendar pre-programmed from the year 1995 to 2039

Alarm  Daily alarm with 20-second beeper, hourly time signal

 

GPS Mode

Receiver frequency  1575.42MHz

Tracking code  C/A

Receive channels/Tracking method 8/parallel

Maximum satellite tracks 8

Update rate   1 second (Continuous Mode)

Measurement accuracy  Average 30m (Continuous Mode)

Average acquisition  Warm start: 50 seconds Hot start: 15 seconds

Tracking sensitivity   -130dBm

Display screens   Current position; waypoint plot; map plot; graphical navigation; direction and speed

User settings  Waypoints; landmarks; area; data; map plot scale; distance units; speed units

GPS Measurement   Current location: Latitude (degrees, minutes, seconds north or south) and Longitude (degrees, minutes, seconds east or west)

Measurement modes: One-Shot (single measurement), Quick Mode (fast measurement), Auto Mode (measurements at 1-minute intervals), Continuous Mode (measurements at 1-second intervals)

Memory  Landmark memory: Up to 200 location records, each including a 14-character name, latitude, and longitude

Route memory: Up to 100 points, each including month, day, measurement time, latitude and longitude

Navigation  Landmark name, landmark pointer, landmark direction, landmark distance display, bearing and speed (with 1-second continuous reading)

Area setting  City code, latitude, longitude, and GMT time

  Measurement and average acquisition may vary due to the actual satellite pattern, radio wave conditions, and system operating conditions.

  Average acquisition time may also be longer for the first measurement after not performing any measurement with the watch for a long period or following battery replacement.

  This watch converts speed values as follows: 1mph=1.609 kph, 1 knot=1.852 kph

 

General

Water resistant

Electro-luminescent backlight (afterglow)

Operating temperature   0 to 50°C (32 to 122°F)

Power requirements  One CR2 lithium battery (available separately)

Approximate battery life  Following shows approximate battery life using noted mode only.

Quick Mode: 5 hours (average of five seconds per measurement)

One-Shot Mode: 720 measurements (average of 20 seconds per measurement)

Continuous Mode:4 hours (non-stop measurement)

Auto Mode: 12 hours (automatic meas. every minute, average of 20 seconds per meas)

Size of case   65.5 x 66.6 x 29.6mm

Weight    138g (including battery)

Signal reception from GPS satellites may be difficult or even impossible inside buildings, underground, among tall buildings, in densely wooded area, near high voltage lines, or inside a motor vehicle.

This watch is water resistant under normal daily use. You can wear it in the rain or when washing your hands, but you should avoid wearing it when swimming, bathing, washing a car, etc.

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1. What conditions affect GPS reception?   http://www.netwiz.net/~chrisg/suppcont_faqs.html
GPS works anywhere in the world, but it has some limitations. Stone, concrete, rock, and steel all block GPS signals. For this reason, GPS performance suffers when the antenna is indoors; surrounded by tall buildings or mountains; or in a tunnel, cave, or canyon. Dense green foliage can also block GPS signals. As SkyMap has an indoor/interior antenna, the user must place the antenna near or against a window to receive GPS telemetry