Weather

Open a trip and tap “Weather”. Each hour has a row with temperature, conditions, wind, current and waves. A value Manta does not have stays empty.

Sources

Manta fills each value of an hour on its own, in this order:

1. Your instruments, when they report it.
2. A weather entry you logged in that hour.
3. Apple Weather, for temperature, conditions and wind only.

Fetching from Apple Weather

Recording needs no internet connection, but fetching does. Manta fetches a trip's weather once, when you open the finished trip, open its tour or publish it to the web. Without a connection, the values stay empty and Manta tries again the next time you open the trip.

All hours use one position, from the middle of the trip, so on a long passage the values are less exact far from it. Cropping or merging a trip discards the weather, including your corrections, and Manta fetches it again.

Under Settings → Weather, you can turn off “Fill weather gaps from Apple Weather”. Opening a trip or tour then fetches nothing, and the “Weather” tab shows only what your instruments measured and what you logged.

Recording intervals

Wind from your instruments is stored about every 5 seconds, air temperature and pressure every 5 minutes, and the sea state about every 10 minutes. Apple Weather gives one set of values per hour. Manta adds no weather entries to the log by itself.

Sea state

Apple Weather has no wave data. While recording, Manta estimates wave height and period from the motion of your device, so mount it somewhere fixed or lay it flat. In a pocket, this does not work. The figure is a rough trend. “Wave motion” under Settings → Automatic logging turns it off. See Sea state and waves explained.

Correcting an hour

1. In the trip's “Weather” tab, tap an hour.
2. Change the condition, “Cloud cover”, “Temperature”, “Barometer”, wind or waves, and tap “Done”.

Corrections do not appear in the log. For waves, your correction replaces the estimate. Values your instruments measured stay: wind is then read-only, and changes to temperature or pressure have no effect. Values from a weather entry also stay, so edit the entry itself under “Logs”.

Weather entries

While recording, tap the “Weather” quick action and choose a condition. On a finished trip, use “Add log” under “Logs”. See Manual entries.

Manta Pro

The “Weather” tab comes with the app, on every trip. The charts for wind, air temperature, waves and current, under “Stats” and in the replay, and the wind card of a tour are part of Manta Pro. The replay shows their values at each moment on Free too. See Free and Pro.