A wind-powered masthead sensor and a sunlight-readable display that show you what the wind is really doing, and how your trim changes your speed. For dinghies and keelboats.
Feel takes years to build. Numbers make every puff, every tack and every sheet adjustment measurable, so you learn in a season what used to take ten. SailNav shows you the few numbers that matter, big and clear, right where you look.
Boat speed · target %
Learn trim faster
Ease the sheet, move your weight, change the vang, and watch speed respond in real time. The feedback loop that coaches give you, on every run.
TWS · TWA · TWD
True wind, not just a feeling
The sensor measures the apparent wind; SailNav combines it with GPS speed, heading and heel to compute the true wind speed, angle and direction.
VMG
VMG: speed where it counts
Pointing higher or footing faster? Velocity made good tells you which one actually gets you to the windward mark first.
Tack angle · lifts & headers
Tacking angles and shifts
See how many degrees you really tack through, and spot lifts and headers from the wind-shift tracker before your rivals do.
Countdown · distance to line · bias
Win the start
Start countdown synced with one key, ping both line ends, then read distance and time to the line, time to burn and line bias.
Anchor alarm · barometer
Safety and anchor watch
GPS anchor watch with an alarm radius and buzzer, plus a barometer trend that warns you when the weather is turning.
Data-driven progress
Every session is a data set: wind, speed, heel and course. Recording on the unit and a companion app to review your day ashore are on the roadmap planned, so you and your coach can compare today with last month.
Two lines, one platform
Start on a dinghy. Grow into a keelboat.
Both lines share the same display electronics, the same screens and the same wind-sensor technology. Pick the one that fits your boat today.
Concept illustration
For dinghies
SailNav Clip
A wireless, wind-powered masthead head and a floating display that clips onto the mast. Remove both in seconds when you de-rig.
Wind-powered wireless head: no cables, no charging
Mast-mounted display on a sportboat. Photo composite, product rendering. Photo: Daniel Stenholm, Unsplash
Actual 320 × 240 firmware screens of the prototype, shown in a simplified frame.
Six screens, four keys
Your coach at the masthead.
Sail by the wind
A big apparent-wind dial with close-hauled sectors and a true-wind marker, next to wind speed and boat speed. It is the one screen you need to learn to sail to the wind.
AWA
apparent wind angle
AWS/TWS
apparent and true wind speed
STW
boat speed
Performance
Boat speed and VMG in huge digits, a target-speed bar and a heel gauge. Change one thing, watch the numbers, keep what works.
VMG
velocity made good
TGT
percentage of target speed
HEEL
from the 9-axis motion sensor
Navigation
Heading tape with course-over-ground and waypoint markers, bearing and distance to the mark, cross-track error, ETA and position from the built-in GNSS.
COG/SOG
course and speed over ground
BRG/DTW
bearing and distance to waypoint
XTE
cross-track error
Race start
Countdown with the 5-4-1-0 sequence. The four keys become SYNC, +1, −1 and PING: ping both ends of the line, then read distance, time to line, burn time and line bias.
DIST
distance to the line
BURN
time left to kill
BIAS
favoured end, in degrees
Weather and tactics
Barometric pressure with a 24-hour trend, and a 30-minute wind-direction tracker that calls lifts and headers for you.
BARO
pressure and trend
TWD
true wind direction, shifts
AIR
air temperature
Anchor watch
Drop the anchor, arm the alarm. SailNav plots your swing circle and sounds the buzzer if you drag outside the radius you set.
DIST
distance to the anchor
ALARM R
alarm radius
BRG
bearing to the anchor
Technology
Wind-powered. Wire-free. Readable in full sun.
The dinghy wind head makes its own electricity from the wind it measures. The display uses reflective memory-in-pixel technology, so the brighter the sun, the better it reads.
Coreless axial-flux generator in the rotor hub: no cogging, so the rotor stays a precise instrument.
Fully potted electronics with a hermetic cell and contactless magnetic direction sensing: no connectors, no openings.
Bluetooth LE broadcast at 4 Hz to the display, on a latest-generation Nordic nRF54 platform.
Gimasi Marine is a division of Gimasi SA, a Swiss IoT company founded in 2012 in Mendrisio, Ticino. We have spent more than a decade building low-power, connected electronics. SailNav brings that know-how on board.
Schematic and board design of the display unit, enclosure CAD, firmware screens.
Wind sensor design study
Generator, energy budget, direction sensing and radio link modelled.
Prototypes
Board layout, first builds and on-water testing.
Kickstarter campaign
Early-backer units for both lines.
Production and delivery
Dates will be announced with the campaign.
Kickstarter · coming soon
Be first on the water with SailNav.
We are preparing our Kickstarter campaign. Leave your e-mail and we will tell you the day it goes live, with all the details of the early-backer rewards.
