Garmin GPSCOM 170 Instrukcja Użytkownika Strona 38
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VHF Line-of-Sight Calculator Page
The GPSCOM 170’s line-of-sight calculator page can
be used to estimate the transmitting and receiving dis-
tance between the unit and another station.
Regardless of transmitter power, VHF marine radio’s
transmitting and receiving range is generally limited by
“line of sight.” This means that you must be located such
that land masses, the curvature of the earth, or anything
else that would limit your ability to see in a straight line
does not substantially come between your antenna and
the antenna you are communicating with.
If you know the height of your vessel’s receiving
antenna and the height of the transmitting antenna at the
station you desire to receive from, the probable range of
communications can be automatically calculated using
the line-of-sight calculator page.
To access the line of sight calculator page from the
com setup page:
1. Highlight the ‘LINE OF SIGHT’ field and press
E
.
The top section of the line of sight calculator page
displays the transmitting antenna height field and receiv-
ing antenna height field. The bottom of the page displays
the line-of-sight calculation field.
To determine an approximate line of sight distance:
1. Highlight the ‘Transmitting Antenna Height’ field and
press
E
.
2. Using the arrow keypad, enter the known height of
your antenna (the default value is 5 ft., which is the
approximate height from the deck to bottom of the flex
antenna with the radio being held in your hand. After
you enter a height, press
E
.
3. Highlight the ‘Receiving Antenna Height’ field and
press
E
.
4. Enter the known height of the receiving antenna using
the arrow keypad and press
E
.
5. The approximate line of sight distance (the probable
range of communication) will appear in the ‘LINE OF
SIGHT’ field.
IMPORTANT!
Antenna height, more than
any other factor, is respon-
sible for determining how
far you can transmit. An
antenna which is mounted
up high can “see” farther
over the horizon.
Line-Of-Sight
Calculator
Page
Reference
33
Line-Of-Sight
Calculator Page
170 manual pages rev D 9/21/98 9:23 AM Page 33
- Manual & 1
- Reference 1
- IMPORTANT! 3
- GPSCOM 170 4
- OWNER’S MANUAL 4
- Cautions 5
- Table Of 6
- Contents 6
- Description 7
- Keys and 10
- Controls 10
- Acquiring 11
- Satellites 11
- Position Page 12
- Position and 14
- Map Pages 14
- Moving Map 15
- Using The 16
- Highway Page 16
- To select the compass page: 17
- Menu Page 18
- Satellite Page 18
- Map Page 18
- Com Setup Page 19
- Channel Page 19
- Mem Bank Page 19
- Transmitting 20
- To select channel 16: 21
- To select channel 9: 21
- To select a weather channel: 21
- Dual Watch 22
- Satellite Status 23
- Receiver Status 24
- Backlighting 25
- To change or add a comment: 32
- To rename a stored waypoint: 33
- Memory Bank Page 34
- To select an operating mode 35
- To select a scanning type: 36
- To select priority scan: 36
- To enter a delay time: 37
- To change the operating band: 37
- To change the call channel: 37
- To select a numbered bank: 39
- To enter user comments: 39
- To enter channels: 40
- To edit a list: 40
- Changing a default defini 41
- Channel Definition 41
- To lock a channel out: 42
- To select the memory page: 43
- To activate tri watch: 43
- To switch to five watts: 43
- To cancel an active GOTO: 44
- To activate the MOB mode: 44
- TracBack Navigation 45
- TracBack 46
- Navigation 46
- To clear a route from memory: 49
- To activate a route: 50
- Compass Page 55
- To GOTO the target crosshair: 58
- To view the message page: 61
- System Setup 62
- To select the time format: 63
- To set the screen contrast: 63
- To set the backlight timer: 63
- To specify a tone setting: 63
- To select a position format: 64
- To select a map datum: 64
- To enter a CDI scale setting: 64
- To select an I/O format: 66
- To select a transfer option: 66
- To select a NMEA format: 66
- DGPS Interface 67
- To activate the simulator: 68
- Initializing The 69
- Receiver 69
- To initialize the receiver: 70
- Accessories & 72
- Installation 72
- Channel List 75
- Specifications 77
- Messages 79
- Map Datums 81
- TIme Offset 83
- APPENDIX H 84
- LIMITED WARRANTY 87
- © 1997 GARMIN CORPORATION 88
- GARMIN (Europe) Ltd 88
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