Operation Manual
FarSounder, Inc.
F31552 (Rev. 2.6.1)
Page 49 of 56
receiving during that period, no image will be seen. Additionally, if the unit is in the water and a wave trough
is between the sonar and a target of interest, the trough will block the sonar from “seeing” the target. The
sonar works as a line of sight system and sonar energy cannot cross the water/air boundary.
5. Vessel Speed Limitations
The FarSounder-500 and FarSounder-1000 sonars are designed for use at vessel speeds up to 20 and
25 knots respectively. This rating is based upon an ideal installation where vessel induced mechanical
vibration noise is not present. Some vessels have significant mechanical vibration or create turbulence in
front of the Transducer Module. In these cases, system performance may degrade a speeds less than the
stated maximums. Going beyond these speeds will not damage the system. However, at higher speeds,
performance will decrease as speed increases. That being said, some FarSounder customers have reported
good performance even at speeds over 25 knots.
