Vemco VR100, Руководство по эксплуатации

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VEMCO – VR100 Receiver Operating Manual – Page 47
5 APPENDIX
5.1 ADDITIONAL INFORMATION
5.1.1 GPS
The GPS (Global Positioning System) works by coordinating position information from multiple satellites.
It needs to see three satellites to get a good position fix. Once it sees even one satellite, it can download an
almanac from that satellite to get an idea of where to expect other satellites to be located, and therefore get
its three satellites faster.
On the VR100 receiver screen, when the GPS is locked and getting position fixes then the longitude and
latitude will be displayed on the second line of the main menu, in decimal degrees:
XX.XXXXXA XXX.XXXXXB
where X is a digit (0-9), A is N (North) or S (South), and B is E (East) or W (West).
When the VR100 is not locked, the GPS message displayed will be one of those listed in Table 5.1-1. The
status of the GPS is updated every 5 seconds.
IMPORTANT
The VR100 internal GPS is designed to provide accurate time sync data for the system clock and
GPS coordinates for the purpose of marking approximate position whenever a VEMCO transmitter
is detected within acoustic range (up to 2 km distance). The VR100 GPS was not intended to
provide precise tracking positions or as a navigation aid designed to assist in planning routes. The
VR100 GPS is not to be used for any applications in which the reliability or accuracy could result in
a situation of personal injury.
For optimal GPS operation ensure that you are using the latest version of VR100 firmware
version 3.2.0 or later.
Check version using Config menu

2 System

6 Version

MCORE
We recommend that you use a WAAS enabled handheld GPS receiver along with the VR100.
The Global Positioning System (GPS) is operated by the U.S. Government, which is solely
responsible for the accuracy and maintenance of the GPS network. The accuracy of position fixes
can be affected by the periodic adjustments to GPS satellites made by the U.S. government and
are subject to change in accordance with the Department of Defence civil GPS user policy and the
Federal Radio navigation Plan. Accuracy can also be affected by poor satellite geometry and
obstructions, like buildings and large trees, and boat canopies.