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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..5c862bf
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "fit2mf2"
+version = "0.1.0"
+description = "Convert a Garmin FIT file into a Microformat entry"
+repository = "https://git.jesterpm.net/pub/jesterpm/fit2mf.git"
+license = "MIT"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.4.14", features = ["derive"] }
+chrono = "0.4"
+fitparser = "0.6"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+serde_with = "3.6"
+geo-uri = { version = "0.2.1", features = ["serde"] }
+geo = "0.27.0"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..365f9c8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,141 @@
+fit2mf2
+=======
+
+A utility to convert a Garmin FIT data file into a microformat entry.
+
+
+Usage
+-----
+
+    Usage: fit2mf2 [OPTIONS] [FILE]
+
+    Arguments:
+      [FILE]  FIT file to convert. If no file is given, reads from stdin.
+
+    Options:
+      -t, --category <CATEGORY>       Category to add to the entry.
+                                      May be given more than once.
+
+          --hide <lat,long,radius>    Location to mask in output. Radius in
+                                      meters. May be given more than once.
+
+      -h, --help
+
+
+Sample output
+-------------
+
+    {
+      "type": [
+        "h-entry"
+      ]
+      "properties": {
+        "activity": [
+          {
+            "sport": "running",
+            "start": "2021-06-19T14:51:50Z",
+            "start_position": "geo:47.6264,-122.3371",
+            "end_position": "geo:47.6264,-122.3371",
+            "max_heart_rate": {
+              "num": 195.0,
+              "unit": "bpm"
+            },
+            "max_speed": {
+              "num": 3.76,
+              "unit": "m/s"
+            },
+            "timer": {
+              "num": 3742.613,
+              "unit": "s"
+            },
+            "ascent": {
+              "num": 115.0,
+              "unit": "m"
+            },
+            "avg_heart_rate": {
+              "num": 169.0,
+              "unit": "bpm"
+            },
+            "avg_speed": {
+              "num": 2.7,
+              "unit": "m/s"
+            },
+            "calories": {
+              "num": 691.0,
+              "unit": "kcal"
+            },
+            "descent": {
+              "num": 171.0,
+              "unit": "m"
+            },
+            "distance": {
+              "num": 10104.88,
+              "unit": "m"
+            },
+            "duration": {
+              "num": 3742.613,
+              "unit": "s"
+            },
+            "laps": [
+              {
+                "sport": "running",
+                "start": "2021-06-19T14:51:50Z",
+                "start_position": "geo:47.6264,-122.3371",
+                "end_position": "geo:47.6336,-122.3401",
+                "ascent": {
+                  "num": 7.0,
+                  "unit": "m"
+                },
+                "avg_heart_rate": {
+                  "num": 144.0,
+                  "unit": "bpm"
+                },
+                "avg_speed": {
+                  "num": 2.876,
+                  "unit": "m/s"
+                },
+                "calories": {
+                  "num": 53.0,
+                  "unit": "kcal"
+                },
+                "descent": {
+                  "num": 2.0,
+                  "unit": "m"
+                },
+                "distance": {
+                  "num": 1000.0,
+                  "unit": "m"
+                },
+                "duration": {
+                  "num": 347.712,
+                  "unit": "s"
+                },
+                "max_heart_rate": {
+                  "num": 177.0,
+                  "unit": "bpm"
+                },
+                "max_speed": {
+                  "num": 3.602,
+                  "unit": "m/s"
+                },
+                "timer": {
+                  "num": 347.712,
+                  "unit": "s"
+                }
+              },
+              ...
+            ]
+          }
+        ],
+        "location": [
+          "geo:47.6264,-122.3371"
+        ],
+        "published": "2021-06-19T14:51:50Z"
+      },
+    }
+
+Contributing
+------------
+
+Send questions, bug reports, and patches to jesse@jesterpm.net.
+
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d2c8f0d
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,406 @@
+use chrono::{DateTime, Utc};
+use clap::Parser;
+use fitparser::profile::MesgNum;
+use fitparser::{self, FitDataField, FitDataRecord};
+use geo::algorithm::geodesic_distance::GeodesicDistance;
+use geo::Point;
+use geo_uri::GeoUri;
+use serde::{Deserialize, Serialize};
+use serde_json::json;
+use std::fs::File;
+use std::io::{prelude::*, stdin, stdout};
+use std::process;
+use std::str::FromStr;
+
+#[derive(Parser, Debug)]
+struct Args {
+    #[arg(short = 't', long = "category")]
+    category: Vec<String>,
+
+    #[arg(long = "hide")]
+    hidden_location: Vec<ExclusionPoint>,
+
+    file: Option<String>,
+}
+
+const SEMICIRCLE: f64 = 11930465.0;
+
+#[derive(Debug, Copy, Clone)]
+struct ExclusionPoint {
+    center: Point,
+    radius: f64,
+}
+
+impl ExclusionPoint {
+    pub fn contains(&self, pos: &Point) -> bool {
+        let distance = self.center.geodesic_distance(pos);
+        distance <= self.radius
+    }
+}
+
+impl FromStr for ExclusionPoint {
+    type Err = Box<dyn std::error::Error>;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut it = s.split(',');
+        let latitude = it.next().unwrap().parse()?;
+        let longitude = it.next().unwrap().parse()?;
+        let radius = it.next().unwrap().parse()?;
+        Ok(ExclusionPoint {
+            center: Point::new(longitude, latitude),
+            radius,
+        })
+    }
+}
+
+impl From<String> for ExclusionPoint {
+    fn from(s: String) -> Self {
+        Self::from_str(&s).unwrap()
+    }
+}
+
+#[derive(Serialize, Deserialize, Clone)]
+struct Measure {
+    num: f64,
+    unit: String,
+}
+
+fn as_measure(value: &FitDataField) -> Option<Measure> {
+    let num = match *value.value() {
+        fitparser::Value::Byte(v) => v as f64,
+        fitparser::Value::SInt8(v) => v as f64,
+        fitparser::Value::UInt8(v) => v as f64,
+        fitparser::Value::SInt16(v) => v as f64,
+        fitparser::Value::UInt16(v) => v as f64,
+        fitparser::Value::SInt32(v) => v as f64,
+        fitparser::Value::UInt32(v) => v as f64,
+        fitparser::Value::Float32(v) => v as f64,
+        fitparser::Value::Float64(v) => v,
+        fitparser::Value::UInt8z(v) => {
+            if v == 0 {
+                return None;
+            } else {
+                v as f64
+            }
+        }
+        fitparser::Value::UInt16z(v) => {
+            if v == 0 {
+                return None;
+            } else {
+                v as f64
+            }
+        }
+        fitparser::Value::UInt32z(v) => {
+            if v == 0 {
+                return None;
+            } else {
+                v as f64
+            }
+        }
+        fitparser::Value::SInt64(v) => v as f64,
+        fitparser::Value::UInt64(v) => v as f64,
+        fitparser::Value::UInt64z(v) => {
+            if v == 0 {
+                return None;
+            } else {
+                v as f64
+            }
+        }
+        fitparser::Value::Timestamp(_) => return None,
+        fitparser::Value::Enum(_) => return None,
+        fitparser::Value::String(_) => return None,
+        fitparser::Value::Array(_) => return None,
+    };
+    let unit = value.units().to_string();
+    Some(Measure { num, unit })
+}
+
+#[serde_with::skip_serializing_none]
+#[derive(Default, Serialize, Deserialize, Clone)]
+struct Session {
+    sport: Option<String>,
+    start: Option<DateTime<Utc>>,
+    start_position: Option<GeoUri>,
+    end_position: Option<GeoUri>,
+    duration: Option<Measure>,
+    timer: Option<Measure>,
+    avg_heart_rate: Option<Measure>,
+    max_heart_rate: Option<Measure>,
+    min_temperature: Option<Measure>,
+    avg_temperature: Option<Measure>,
+    max_temperature: Option<Measure>,
+    avg_speed: Option<Measure>,
+    max_speed: Option<Measure>,
+    ascent: Option<Measure>,
+    descent: Option<Measure>,
+    calories: Option<Measure>,
+    distance: Option<Measure>,
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    laps: Vec<Session>,
+}
+
+#[derive(Default, Serialize, Deserialize)]
+struct LapSlice {
+    index: u64,
+    count: u64,
+}
+
+#[derive(Default)]
+struct PositionBuilder {
+    latitude: Option<f64>,
+    longitude: Option<f64>,
+}
+
+impl PositionBuilder {
+    pub fn latitude(&mut self, field: &FitDataField) {
+        if let Some(value) = as_measure(field) {
+            self.latitude = Some(value.num / SEMICIRCLE);
+        } else {
+            self.latitude = None
+        }
+    }
+
+    pub fn longitude(&mut self, field: &FitDataField) {
+        if let Some(value) = as_measure(field) {
+            self.longitude = Some(value.num / SEMICIRCLE);
+        } else {
+            self.longitude = None
+        }
+    }
+
+    pub fn as_point(&self) -> Option<Point> {
+        if let (Some(lat), Some(lon)) = (self.latitude, self.longitude) {
+            Some(Point::new(lon, lat))
+        } else {
+            None
+        }
+    }
+}
+
+impl From<PositionBuilder> for Option<GeoUri> {
+    fn from(val: PositionBuilder) -> Self {
+        if let Some(lat) = val.latitude {
+            if let Some(long) = val.longitude {
+                return GeoUri::builder()
+                    .latitude(round_geo(lat))
+                    .longitude(round_geo(long))
+                    .build()
+                    .ok();
+            }
+        }
+        None
+    }
+}
+
+/// Truncate GPS noise
+fn round_geo(x: f64) -> f64 {
+    (x * 100000.0).round() / 100000.0
+}
+
+fn parse_session(args: &Args, record: &FitDataRecord) -> (Session, LapSlice) {
+    let mut session = Session::default();
+    let mut laps = LapSlice::default();
+    let mut start_position = PositionBuilder::default();
+    let mut end_position = PositionBuilder::default();
+    for field in record.fields() {
+        match field.name() {
+            "sport" => session.sport = Some(field.value().to_string()),
+            "start_time" => session.start = as_datetime(field),
+            "total_elapsed_time" => session.duration = as_measure(field),
+            "total_timer_time" => session.timer = as_measure(field),
+            "avg_heart_rate" => session.avg_heart_rate = as_measure(field),
+            "max_heart_rate" => session.max_heart_rate = as_measure(field),
+            "min_temperature" => session.min_temperature = as_measure(field),
+            "avg_temperature" => session.avg_temperature = as_measure(field),
+            "max_temperature" => session.max_temperature = as_measure(field),
+            "enhanced_avg_speed" => session.avg_speed = as_measure(field),
+            "enhanced_max_speed" => session.max_speed = as_measure(field),
+            "total_ascent" => session.ascent = as_measure(field),
+            "total_descent" => session.descent = as_measure(field),
+            "total_calories" => session.calories = as_measure(field),
+            "total_distance" => session.distance = as_measure(field),
+            "first_lap_index" => laps.index = as_u64(field).unwrap_or(0),
+            "num_laps" => laps.count = as_u64(field).unwrap_or(0),
+            "start_position_lat" => start_position.latitude(field),
+            "start_position_long" => start_position.longitude(field),
+            "end_position_lat" => end_position.latitude(field),
+            "end_position_long" => end_position.longitude(field),
+            _ => (),
+        }
+    }
+
+    // Just say no to hidden locations
+    if let Some(p) = start_position.as_point() {
+        if !args.hidden_location.iter().any(|nope| nope.contains(&p)) {
+            session.start_position = start_position.into();
+        }
+    }
+    if let Some(p) = end_position.as_point() {
+        if !args.hidden_location.iter().any(|nope| nope.contains(&p)) {
+            session.end_position = end_position.into();
+        }
+    }
+    (session, laps)
+}
+
+fn as_datetime(field: &FitDataField) -> Option<DateTime<Utc>> {
+    if let fitparser::Value::Timestamp(ts) = field.value() {
+        Some(ts.to_utc())
+    } else {
+        None
+    }
+}
+
+fn as_u64(field: &FitDataField) -> Option<u64> {
+    let value = match *field.value() {
+        fitparser::Value::Byte(v) => v as u64,
+        fitparser::Value::UInt8(v) => v as u64,
+        fitparser::Value::UInt16(v) => v as u64,
+        fitparser::Value::UInt32(v) => v as u64,
+        fitparser::Value::UInt64(v) => v,
+        fitparser::Value::SInt8(v) => {
+            if v >= 0 {
+                v as u64
+            } else {
+                0
+            }
+        }
+        fitparser::Value::SInt16(v) => {
+            if v >= 0 {
+                v as u64
+            } else {
+                0
+            }
+        }
+        fitparser::Value::SInt32(v) => {
+            if v >= 0 {
+                v as u64
+            } else {
+                0
+            }
+        }
+        fitparser::Value::SInt64(v) => {
+            if v >= 0 {
+                v as u64
+            } else {
+                0
+            }
+        }
+        fitparser::Value::Float32(_) => return None,
+        fitparser::Value::Float64(_) => return None,
+        fitparser::Value::UInt8z(v) => {
+            if v == 0 {
+                return None;
+            } else {
+                v as u64
+            }
+        }
+        fitparser::Value::UInt16z(v) => {
+            if v == 0 {
+                return None;
+            } else {
+                v as u64
+            }
+        }
+        fitparser::Value::UInt32z(v) => {
+            if v == 0 {
+                return None;
+            } else {
+                v as u64
+            }
+        }
+        fitparser::Value::UInt64z(v) => {
+            if v == 0 {
+                return None;
+            } else {
+                v
+            }
+        }
+        fitparser::Value::Timestamp(_) => return None,
+        fitparser::Value::Enum(_) => return None,
+        fitparser::Value::String(_) => return None,
+        fitparser::Value::Array(_) => return None,
+    };
+    Some(value)
+}
+
+fn run() -> Result<(), Box<dyn std::error::Error>> {
+    let args = Args::parse();
+    let mut reader: Box<dyn Read> = match args.file {
+        Some(ref filename) => Box::new(File::open(filename)?),
+        None => Box::new(stdin()),
+    };
+
+    let mut sessions = Vec::new();
+    let mut laps = Vec::new();
+
+    for msg in fitparser::from_reader(&mut reader)? {
+        match msg.kind() {
+            MesgNum::Session => {
+                sessions.push(parse_session(&args, &msg));
+            }
+            MesgNum::Lap => {
+                laps.push(parse_session(&args, &msg));
+            }
+            _ => (),
+        }
+    }
+
+    let activity: Vec<Session> = sessions
+        .into_iter()
+        .map(|(mut s, l)| {
+            let start = l.index as usize;
+            let end = (l.index + l.count) as usize;
+            if end > start {
+                s.laps = laps[start..end].iter().map(|(s, _)| s.clone()).collect();
+                s
+            } else {
+                s
+            }
+        })
+        .collect();
+
+    let location = activity
+        .iter()
+        .flat_map(|s| s.start_position)
+        .map(|uri| uri.to_string())
+        .take(1)
+        .collect();
+
+    let properties = EntryProperties {
+        published: activity.iter().flat_map(|s| s.start).min(),
+        category: args.category.clone(),
+        location,
+        activity,
+    };
+
+    let output = json!({
+        "type": ["h-entry"],
+        "properties": properties
+    });
+
+    serde_json::to_writer(stdout(), &output)?;
+
+    Ok(())
+}
+
+#[serde_with::skip_serializing_none]
+#[derive(Default, Serialize, Deserialize, Clone)]
+struct EntryProperties {
+    published: Option<DateTime<Utc>>,
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    category: Vec<String>,
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    location: Vec<String>,
+    activity: Vec<Session>,
+}
+
+fn main() {
+    process::exit(match run() {
+        Ok(_) => 0,
+        Err(e) => {
+            eprintln!("Error: {e}");
+            1
+        }
+    })
+}