User manual GARMIN VHF 725

[. . . ] VHF 725 submersible marine radio owner's manual and reference guide © 1999 GARMIN Corporation GARMIN International, Inc. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ UK Tel. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without prior written consent of GARMIN Corporation. GARMIN Corporation hereby grants permission to download a single copy of this manual onto a hard drive or other electronic storage medium to be viewed for personal use, provided that such electronic or printed copy of this manual contains the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual is strictly prohibited. [. . . ] This practice will ensure a fully charged spare battery at all times. Battery Pack D-Ring with Slot FIGURE 3 Selecting a Channel To begin using the VHF 725 you will want to select a channel to monitor while you personalize the unit settings, such as volume and squelch. When you power-up the unit, a channel will automatically be selected, but it may not be suitable for making unit settings. Use the U/I/C Channel Band key to select USA, International, or Canadian channel bands. (Figure 4) The unit was set at the factory to channel 10 before shipment. Press the UP or DOWN arrow key to scroll through the channels available on the selected band. (Figure 4) If you dont know which channel to select, refer to the Channel List in Appendix C on pages 28 and 29. Selected Channel Band Select Channel Select FIGURE 4 16 NOTE: You will notice an A indicator adjacent to some channel numbers in the USA and Canadian bands. These are simplex channels (transmitting and receiving on the same frequency) while the International counterpart is a duplex channel (transmitting on one frequency while receiving on another. ) GETTING STARTED Setting the Squelch Threshold Setting the Squelch Threshold Setting the Squelch is important for reception of signals you want to hear. There are ten threshold levels, from 0, which allows all signals to be received, to 9, which allows only the strongest signal to be heard through the speaker. The diagram in Figure 5 demonstrates how setting the threshold level allows you to hear only the signals you desire, while weaker, unintelligible signals are not heard. Adjust the Squelch to the lowest setting by pressing and holding the Squelch (SQ) key, then pressing the DOWN arrow key repeatedly until the display indicates L0. If you hear a voice transmission, change to another channel and repeat this step. While holding the Squelch (SQ) key down, use the UP arrow key to increase the squelch level to L1. If no static is heard, you have set an acceptable squelch threshold level. If you hear static, then increase to the next threshold level, repeating the process until unwanted static is eliminated. The squelch setting is universal for all channels, but it may require resetting from time to time NOTE: During squelch adjustment, Tri-Watch, Scan, and Weather Alert are suspended. Up/Down Keys Squelch (SQ) Key Signal At Level 6 5 4 Only Signals Sronger Than Level 5 Will Be Heard 3 2 1 EXAMPLE of THRESHOLD SET AT LEVEL 5 Selected Squelch Level FIGURE 5 17 GETTING STARTED Adjusting Volume, Scanning Adjusting the Volume +/- keys. Press the + key to increase the volume or the - key to decrease the volume. (Figure 6) The Volume key may be adjusted using the band of gradually rising bars on the LCD display. Scanning Channels Volume Level Indicator Volume Decrease Increase FIGURE 6 You may want to keep in contact with several vessels in your immediate area at the same time. You can program up to ten channels from any combination of USA, International, or Canadian bands into memory. Whenever a transmission is received, the scan will stop at that channel until the transmission ends and then move on until it recognizes another transmission. You cannot scan weather channels since they broadcast continually and do not allow a break in transmission for the scan to move to the next channel. You can utilize the WX Alert feature to monitor for severe weather conditions. To scan channels: Scanning Display Band Select Channel Select 1. [. . . ] Screen Messages "LOW BATT" - This display appears when the battery capacity has dropped to 10% of its capacity. The "LOW BATT" display flashes and an initial three beep tone will be heard. The unit will operate under normal use for approximately 30 more minutes. "WX ALERT" - When the Weather Alert feature is activated by a weather alert broadcast, the weather alert tone will be heard and the "WX ALERT" display will flash. [. . . ]