Replay a trip on the map, see which charts need instruments, and read your boat's polar chart.
Every trip can be replayed on the map and viewed as charts.
Replaying a trip
On iPhone, tap the map above the trip page. On iPad the controls are always on the map.
- The play button moves the boat along the track, five minutes of the trip per second.
- Drag the timeline, or tap the track, to jump to a moment.
- Tap an instrument tile to open its chart and colour the route by its values.
Charts and their data
Charts are under “Stats” on the trip page. The headline switches between “Boat”, “Water” and “Weather” when a trip has data for more than one. Hold a chart to read a moment, tap it to open it in the replay.
| Chart | Data it needs |
|---|---|
| Speed | GPS. With a speed sensor, “SOG” and “STW” switch the view |
| Heel | Attitude sensor, otherwise the iPhone's motion |
| Waves | Estimate from the iPhone's motion |
| Wind, Depth, Air temperature, Water temperature | The matching sensor |
| Current | Speed through the water and heading |
| Performance | Wind and your boat's polar |
Trips without instruments
A GPS-only trip has the Speed chart. With Pro it can also show Heel and Waves. Anything not recorded is left out, in the replay too. Wind from the Weather tab does not fill the Wind chart. To record instrument data, connect your plotter.
Reading the polar
Open your boat's page and tap “Polar chart”. Sailboats only.
- The angle is the true wind angle, the distance from the centre is boat speed.
- Each colour is one wind speed.
- Dots mark angles you sailed. Between them the line is estimated.
How the polar is built
Only stretches under sail with the engine off count, from a “Sails up” entry to “Sails down”, anchoring or arrival, with wind recorded from your instruments. An angle needs three steady 20-second blocks at a given wind speed, and its value sits near the best of them.
The polar uses speed through the water if that covers at least 80 % of the sailed values, otherwise speed over ground with a warning. Without usable stretches you see “Not enough wind data”.
The Performance chart compares your speed with this polar. 100 % is a realistic target pace, and from 90 % up counts as well sailed.
Manta Pro
Replay and the chart of speed over ground come with the app. In the replay, every instrument tile shows its value at the moment you scrub to. The other charts are part of Manta Pro, in the replay too. Your first three trips with instruments, recorded or imported, show every chart, and so does the demo trip. The “Polar chart” page always needs Pro.
Related pages
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