Raymarine Hunter 33 Owners’ Notes page 17

AIS Transceiver
• The Raymarine AIS700 is the latest AIS transceiver. It shows nearby boats and
ships that are equipped with AIS on the chartplotter screen.
• Nearby boats and ships equipped with AIS can see Cool Runnings on their
screens
• It is turned on when the VHF radio breaker switch is on.
• We try to leave it set to "on" in the chartplotter
• You can set alarms and tracking, but we leave those off in the marina or the
alarms go off due to boats in their slips!
• Touch a boat icon and you can see detailed information about the boat
Check to make sure the AIS boat icons are displayed on the chart. If not, select the chart
menu and then display options. AIS should be set to on. To turn on alarms and see a list
of targets, select the Radar and AIS option. Make sure both the GPS and the VHF
breaker switches are on.
Depthsounder
The Raymarine depthsounder transducer is calibrated in feet and is set to read from the
transducer, which is about a foot below water level. If you assume the reading is from
the top of the water, you will have a very modest 1 foot safety margin. Due to rocks, we
get nervous in anything less than 30 feet underway and 15 feet in an anchorage.
The depth is displayed on the i70 instrument to the left and prominently on the
chartplotter the way we have it set up. (Depth is the most important information to
monitor in these waters).
Please note that depthsounders sometimes give false readings in really deep water. In
the San Juans, 400'-600' are common depths in some channels and you may see false
readings as the sensitivity on the transducer increases in an effort to give some reading,
often from changes in water density, salinity, or underwater debris.
Due to those changes in depth readings (especially in very deep water), we do not set
depth alarms, but always know our position on the chart.
Please note: You cannot rely on the depthsounder to avoid rocks! It is possible to go
from 300' to on the rocks in less than 30 seconds under sail in some areas! The answer
is simple: we always plan our route on the chart and track our position on the
chartplotter. Rocks are clearly marked.
Last revised: April 2019
Highlights
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