Raymarine i40 Depth Display System w/Transom Mount Transducer

The Raymarine i40 Depth System with transom transducer is a compact depth package for small cruisers, day boats, tenders, and sailing boats that need a clear bottom reading at the helm. Its simple segmented display avoids tying up a larger chartplotter page, while the included P37 transom-mount sensor keeps installation straightforward on boats where a through-hull fitting is not preferred.

The display runs from a 12V supply and draws only 35-50mA, so it adds very little load to a small boat’s electrical system. The P37 transducer sends depth data to the i40, while SeaTalk carries the information to compatible Raymarine instruments. SeaTalkng connection is available through a converter. This is a depth instrument rather than a fishfinder; it does not provide side imaging, charts, GPS, or detailed sonar views.

Who Is This For?

This compact Raymarine depth system suits small cruisers, tenders, day boats, and boats where a transom-mounted sensor is easier than a through-hull installation. It is not ideal for buyers needing charts, speed, temperature, or imaging sonar; the package is dedicated to depth.

Warranty & Support

Raymarine provides a 2-year standard warranty, or 3 years with registration as listed in the supplied specifications. Warranty exclusions and service procedures were not provided.

The i40 transom system is the easy-install choice compared with the through-hull version. You get the same basic depth display without cutting a 51mm hull opening, which suits smaller boats and trailerable craft. The trade-off is that a transom sensor is more exposed to impact and turbulence. Choose it when the hull and mounting position make transom installation practical.