Every trip comes with charts of everything Manta recorded, from wind and depth to heel, current, waves and performance.
Trip charts
Charts show the trip at a glance: where you were fast, where the wind dropped, where the water got shallow. Each trip opens with its map, log and charts when you finish the recording.
What the charts show
- Speed over ground from your iPhone's GPS, and speed through the water from your log
- Wind, from your instruments
- Depth, from your echo sounder
- Heel, from your instruments or your iPhone's motion
- Current, from speed over ground against speed through the water
- Waves, estimated from the boat's own motion
- Air and water temperature, from your instruments
- Performance, your speed against your boat's polar
How it works
Manta records the track and the instrument values with their timestamps. The charts draw them over the course of the trip, so every curve lines up with the time of day. Tap a chart to open it in the replay, where the route takes the colours of its values.
Free and Pro
The charts are part of Manta Pro. Manta records their data on every trip anyway, so buying Pro later shows them on your earlier trips too.
Connecting instruments
In Settings, open “Connect your plotter” under Instruments. Your first three trips with instruments, each longer than one nautical mile, show every chart, so you can see them fill in on the water.
Questions
Do I need instruments for the charts?
Speed comes from your iPhone's GPS on every trip, and heel and waves from its motion. Wind, depth, speed through the water and temperatures come from your instruments. Manta records all of them on every trip.
How does Manta work out the current?
It compares speed over ground with speed through the water. The difference is the current. This needs your instruments connected.
Where do the wave figures come from?
Manta estimates the waves from the boat's own motion, which your iPhone senses. No extra sensor is needed.
What does the performance chart show?
It compares your speed with your boat's polar, which Manta builds from the trips you sail. 100 % is a realistic target pace.