Alaskan Sea-Duction
Guru
- Joined
- Jul 6, 2012
- Messages
- 8,084
- Location
- USA
- Vessel Name
- Alaskan Sea-Duction
- Vessel Make
- 1988 M/Y Camargue YachtFisher
I guess the question is how many older GPS receivers have been relying on DGPS, and don't support the newer WAAS that replaces it. If I understand this, they will have diminished accuracy once DGPS is turned off. WAAS came out in 2003, so my guess is any GPS receiver introduced since around 2005 probably had WAAS support.
DGPS has been disestablished in many locations for awhile now. Hardly any recreational units have had it for years and years now....you needed a special unit and antenna to even get it when it was popular.
Chris....pretty sure the DGPS site for our area was in the Annapolis area. It was only supposed to barely reach the Delaware coast and because it was a land based signal...because it crossed the Delmarva peninsula, it could have affected the DelBay area reception.
Yep, that would explain. I though the relevant differential transmitter was in NJ somewhere...
I mispoke; the earlier one was a GP-36. The unit began to loose pixels on the screen, though, so I replaced it with a newer GP-39 WAAS-corrected unit, drop-in replacement, all good... but we haven't been out to the coast since then to sorta-kinda confirm the GP-36 alarm was about the differential signal...
-Chris