In Gulf region, GPS signals can be spoofed. Disable suspicious constellations below. If position jumps, try using only GLONASS or BeiDou. Compare with ship's GPS on NAV tab.

Sky plot shows computed satellite positions based on orbital data (TLE). Your phone tracks all visible constellations automatically.

Gulf Spoofing Advisory: GPS spoofing is common in the Gulf region. If your position jumps or is incorrect, use the constellation filter above to disable GPS and try GLONASS or BeiDou only. Compare phone position with ship's ECDIS/GPS. Note: Phone hardware may not allow per-constellation filtering — this filter affects the sky plot display and DOP calculation to help identify which constellation may be compromised.

Take sextant altitude of Sun, Moon, Stars or Planets. Enter observation below. Two or more sights from different bodies → actual position without GPS.

Enter sextant observation above

Send live position from your mobile to any PC browser. Both devices must have internet access. No login or installation required — just type the same URL and enter the code.
Code stays same on this device even after refresh. Position streams continuously every 2 seconds. Auto-reconnects if disconnected.

1. On mobile phone: tap SEND → note the 6-digit code
2. On PC: visit https://gps.marinersapp.com → go to SHARE tab
3. Tap RECEIVE → enter the 6-digit code

Position streams live every 2 seconds. Works between phones too.