{"id":19849528,"url":"https://github.com/filipspl/gps-accuracy","last_synced_at":"2025-08-16T08:22:15.613Z","repository":{"id":92209126,"uuid":"432811285","full_name":"filipsPL/gps-accuracy","owner":"filipsPL","description":"gps accuracy while running - shall we use foodpods?","archived":false,"fork":false,"pushed_at":"2021-12-01T20:49:14.000Z","size":1494,"stargazers_count":3,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"main","last_synced_at":"2025-07-11T20:44:39.586Z","etag":null,"topics":["footpod","forerunner","garmin-watch","gps","gps-data"],"latest_commit_sha":null,"homepage":"","language":"Jupyter Notebook","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/filipsPL.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2021-11-28T19:57:28.000Z","updated_at":"2023-10-17T15:47:33.000Z","dependencies_parsed_at":"2023-06-08T00:06:46.228Z","dependency_job_id":null,"html_url":"https://github.com/filipsPL/gps-accuracy","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/filipsPL/gps-accuracy","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/filipsPL%2Fgps-accuracy","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/filipsPL%2Fgps-accuracy/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/filipsPL%2Fgps-accuracy/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/filipsPL%2Fgps-accuracy/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/filipsPL","download_url":"https://codeload.github.com/filipsPL/gps-accuracy/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/filipsPL%2Fgps-accuracy/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":270684660,"owners_count":24627855,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","status":"online","status_checked_at":"2025-08-16T02:00:11.002Z","response_time":91,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["footpod","forerunner","garmin-watch","gps","gps-data"],"created_at":"2024-11-12T13:21:30.411Z","updated_at":"2025-08-16T08:22:15.582Z","avatar_url":"https://github.com/filipsPL.png","language":"Jupyter Notebook","funding_links":[],"categories":[],"sub_categories":[],"readme":"GPS, footpod, and accuracy\n======================\n\n![footpod](obrazki/footpod_800s.jpg)\n\n\u003c!-- TOC START min:1 max:6 link:true asterisk:false update:true --\u003e\n- [GPS alone vs GPS with footpod](#gps-alone-vs-gps-with-footpod)\n  - [Track](#track)\n  - [Hardware](#hardware)\n  - [Results: distance](#results-distance)\n  - [Results: speed variation during the run](#results-speed-variation-during-the-run)\n\u003c!-- TOC END --\u003e\n\n\n# GPS alone vs GPS with footpod\n\n**tl;dr: footpod increases the distance measurement accuracy of the gps sportwatch.**\n\n## Track\n\nTrack distance: 1.71km +- 0.01km (3x measurements with garmin vista hcx and polar m 400 = 6 measurements), urban environment.\n\n## Hardware\n\nHardware:\n- Garmin Forerunner 945 (GPS+Glonass, 1s track saving)\n  - adidas Mi_coach footpod (ant+ version)\n- Garmin Vista HCx (as a reference)\n- Polar M400 (as a reference)\n\n## Results: distance\n\ntl;dr garmin with footpod measured almost the exact distance of the loop (1.71 km).\n\nThree runs with three settings of garmin forerunner: (1) GPS+footpod, (2) GPS only, and (3) footpod only. All runs accompanied with two other gpses as a reference. Track distance: 1.71km +- 0.01km.\n\n| Round | distance Polar (reference) | distance Vista (reference) | data source | distance | time   | average pace | error  | place |\n| ----- | -------------------------- | -------------------------- | ----------- | -------- | ------ | ------------ | ------ | ----- |\n| 1     | 1.72                       | 1.70                       | GPS+footpod | 1.71     | 9:40.5 | 05:40        | -0.10% | 1 🥇  |\n| 2     | 1.70                       | 1.71                       | GPS         | 1.67     | 9:31.8 | 05:43        | 2.24%  | 3     |\n| 3     | 1.72                       | 1.70                       | footpod     | 1.68     | 9:28.7 | 05:38        | 1.66%  | 2     |\n\n\n- garmin with footpod measured almost the exact distance of the loop (1.71 km, -0.10%).\n- garmin with gps only was the worst, with error +2.24%\n- foot pod only (no GPS!) was 1.66% wrong\n\n\n## Results: speed variation during the run\n\ntl;dr: garmin+footpod offers more \"stable\" and consistent pace/speed\n\n\nRaw data plots. Garmin device + polar m400 as a reference.\n\n![](obrazki/README-515e7979.png)\n\n\nSmoothened data (5s window average). Garmin device + polar m400 as a reference.\n\n![](obrazki/README-3e38311c.png)\n\n\nDistribution of speeds:\n\n![](obrazki/README-5f006c63.png)\n\n\nAnd some statistics:\n\n\u003ctable border=\"1\" class=\"dataframe\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth colspan=\"8\" halign=\"left\"\u003espeed_calc\u003c/th\u003e\n    \u003c/tr\u003e\n    \u003ctr\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003ecount\u003c/th\u003e\n      \u003cth\u003emean\u003c/th\u003e\n      \u003cth\u003estd\u003c/th\u003e\n      \u003cth\u003emin\u003c/th\u003e\n      \u003cth\u003e25%\u003c/th\u003e\n      \u003cth\u003e50%\u003c/th\u003e\n      \u003cth\u003e75%\u003c/th\u003e\n      \u003cth\u003emax\u003c/th\u003e\n    \u003c/tr\u003e\n    \u003ctr\u003e\n      \u003cth\u003ehardware\u003c/th\u003e\n      \u003cth\u003esource\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n      \u003cth\u003e\u003c/th\u003e\n    \u003c/tr\u003e\n  \u003c/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003cth rowspan=\"2\" valign=\"top\"\u003efootpod\u003c/th\u003e\n      \u003cth\u003egarmin\u003c/th\u003e\n      \u003ctd\u003e569.0\u003c/td\u003e\n      \u003ctd\u003e2.958910\u003c/td\u003e\n      \u003ctd\u003e0.105325\u003c/td\u003e\n      \u003ctd\u003e1.99\u003c/td\u003e\n      \u003ctd\u003e2.940002\u003c/td\u003e\n      \u003ctd\u003e2.960083\u003c/td\u003e\n      \u003ctd\u003e3.000000\u003c/td\u003e\n      \u003ctd\u003e3.639984\u003c/td\u003e\n    \u003c/tr\u003e\n    \u003ctr\u003e\n      \u003cth\u003epolar\u003c/th\u003e\n      \u003ctd\u003e574.0\u003c/td\u003e\n      \u003ctd\u003e2.999651\u003c/td\u003e\n      \u003ctd\u003e0.492067\u003c/td\u003e\n      \u003ctd\u003e0.00\u003c/td\u003e\n      \u003ctd\u003e2.900024\u003c/td\u003e\n      \u003ctd\u003e3.000000\u003c/td\u003e\n      \u003ctd\u003e3.199951\u003c/td\u003e\n      \u003ctd\u003e4.500000\u003c/td\u003e\n    \u003c/tr\u003e\n    \u003ctr\u003e\n      \u003cth rowspan=\"2\" valign=\"top\"\u003egps\u003c/th\u003e\n      \u003cth\u003egarmin\u003c/th\u003e\n      \u003ctd\u003e572.0\u003c/td\u003e\n      \u003ctd\u003e2.917657\u003c/td\u003e\n      \u003ctd\u003e0.770542\u003c/td\u003e\n      \u003ctd\u003e0.00\u003c/td\u003e\n      \u003ctd\u003e2.580013\u003c/td\u003e\n      \u003ctd\u003e2.894989\u003c/td\u003e\n      \u003ctd\u003e3.209970\u003c/td\u003e\n      \u003ctd\u003e7.880005\u003c/td\u003e\n    \u003c/tr\u003e\n    \u003ctr\u003e\n      \u003cth\u003epolar\u003c/th\u003e\n      \u003ctd\u003e576.0\u003c/td\u003e\n      \u003ctd\u003e2.957465\u003c/td\u003e\n      \u003ctd\u003e0.302476\u003c/td\u003e\n      \u003ctd\u003e0.00\u003c/td\u003e\n      \u003ctd\u003e2.800049\u003c/td\u003e\n      \u003ctd\u003e3.000000\u003c/td\u003e\n      \u003ctd\u003e3.099998\u003c/td\u003e\n      \u003ctd\u003e4.100006\u003c/td\u003e\n    \u003c/tr\u003e\n    \u003ctr\u003e\n      \u003cth rowspan=\"2\" valign=\"top\"\u003egps+footpod\u003c/th\u003e\n      \u003cth\u003egarmin\u003c/th\u003e\n      \u003ctd\u003e580.0\u003c/td\u003e\n      \u003ctd\u003e2.940086\u003c/td\u003e\n      \u003ctd\u003e0.085252\u003c/td\u003e\n      \u003ctd\u003e1.49\u003c/td\u003e\n      \u003ctd\u003e2.910004\u003c/td\u003e\n      \u003ctd\u003e2.949951\u003c/td\u003e\n      \u003ctd\u003e2.980042\u003c/td\u003e\n      \u003ctd\u003e3.070007\u003c/td\u003e\n    \u003c/tr\u003e\n    \u003ctr\u003e\n      \u003cth\u003epolar\u003c/th\u003e\n      \u003ctd\u003e606.0\u003c/td\u003e\n      \u003ctd\u003e2.852475\u003c/td\u003e\n      \u003ctd\u003e0.672028\u003c/td\u003e\n      \u003ctd\u003e0.00\u003c/td\u003e\n      \u003ctd\u003e2.799988\u003c/td\u003e\n      \u003ctd\u003e3.000000\u003c/td\u003e\n      \u003ctd\u003e3.100002\u003c/td\u003e\n      \u003ctd\u003e4.199997\u003c/td\u003e\n    \u003c/tr\u003e\n  \u003c/tbody\u003e\n\u003c/table\u003e\n\n\n\n\n**Results:**\n\n- garmin with footpod: very stable pace.\n- garmin with gps only: high variability of speed\n- foot pod only (no GPS!): very stable pace.\n- polar m400: pace is more stable than forerunner in gps-only mode. This may be due to averaging [citation needed].\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffilipspl%2Fgps-accuracy","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ffilipspl%2Fgps-accuracy","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ffilipspl%2Fgps-accuracy/lists"}