@spec parse_nmea_coordinate(term(), term()) :: {:ok, float()} | {:error, String.t()}

Convert an NMEA DDMM.MMMM coordinate and its hemisphere letter to degrees.

Examples

iex> Aprs.NMEAHelpers.parse_nmea_coordinate("4903.50", "N")
{:ok, 49.05833333333333}

iex> Aprs.NMEAHelpers.parse_nmea_coordinate("4903.50", "X")
{:error, "Invalid coordinate direction"}

@spec parse_nmea_sentence(term()) :: {:ok, map()} | {:error, String.t()}

Parse an NMEA sentence or a Peet Bros $ULTW packet.

RMC, GGA, GLL, VTG and WPL are decoded, from any two-letter talker id ($GPRMC, $GNRMC, ...). The checksum is stripped and not verified.