What useful boating apps do you use?

Navionics
Marine navigator with complete chart set UK
Windy
Predictwind
Windguru
Met office
RYA safetrx
CA "captains mate"
Visit my harbour

And, for in harbour,
BBC weather
OS maps (brilliant for planning hikes & cycles)
 
My small collection of apps:
Absolute Tides - seems to have a lot of support here
Anchor Pro - although don't use it much as it wakes me up with false alarms!
OpenCPN with OESENC charts for UK and Antares charts - handy when coming into tight anchorages
Weather Pro - the best weather forecasting app IMHO, but detailed forecasts aren't free
Sky Map - not that I do any Astro navigation, but its nice to know what you are looking at when sipping a dram.
 
Nebo (log book app, surprised nobody has mentioned it before)
Imray tides planner
Garmin BlueChart (to be replaced by Active Captain one day)
Weather radar
Safe Trax
 
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