SignalK Nautical Route Planner - Offline tide and vessel-aware routing

Useful zipcode database with helper methods. Contains a zip code to fips code (county code) lookup. Also has the ability to lookup state abbreviation to state name and vice-versa.

Calculates the distance from a point to the edges of a polygon or multi-polygon.

Utility functions

A node for node-red that generates events based on the position of the Sun at the appropriate time of day

A simple Node-RED node that routes messages depending on the time. If the current time falls within the range specified in the node configuration, the message is routed to output 1. Otherwise the message is routed to output 2.

Receive, log, and alert on DSC (VHF digital selective calling) calls — distress, urgency, safety, routine — from NMEA 0183 ($CDDSC/$CDDSE) and NMEA 2000 (PGN 129808).

Calculates the length of a line, perfect for paths or routes.

Calculates the distance between a given point and the nearest point on a line.

Zero-dependency great-circle and WGS-84 ellipsoidal geodesy: haversine/Vincenty distance, bearings, destination point, midpoint, and unit conversions.

Lightweight logic tree solver using promises.

Calculates a point along a line at a specific distance

Generate contour lines from a grid of data.

Creates a buffer around a GeoJSON feature.

Divides a LineString into chunks of a specified length.

Takes a line and returns a line at offset by the specified distance.

Creates a square grid within a bounding box.

Calculates the destination point having travelled the given distance along a Rhumb line.

Creates a grid of rectangular polygons with width and height consistent in degrees.

Creates a triangular grid within a bounding box.