Any other PLRF15c owners?

[TheGerman]

Keep getting slight, but different distance readings between GPS catalogued points in my Trimble/FFS and my PLRF15c. Was trying to figure out if it was either the GPS in the Trimble isn't accurate down to a yard or if the PLRF15C doesn't actually factor in cosine angle on reading distance.

One of them is right; I'm trying to figure out if its the Trimble's GPS or the PLRF.

Just went through the Vectronix manual and didn't see a mention of a cosine function or a way to turn one off/on which is making me think it doesn't have one/calculate it, which is wild to me seeing all the crazy shit its capable of doing.

The distance differences aren't enough (haven't been a problem) to be a big deal at long range, but was putting posts in the ground today to make a quick 100 yard sight in spot that would be exactly the same each time, and ended up with the laser always telling me it was exactly 100 and the registered GPS points in the Trimble/FFS coming up as 96 yards.

Any ideas?

 

[_Windrider_]

Put a slope doper on your gun and do the math.

 

[cwinner]

At 100 yds my money would be on the lazer over the GPS...... how much slope is involved?

Pull a tape measure at 100, measure with both your devices and see which one lying to you!!

It would take a 30% slope to roughly replicate your numbers......... your firing point would be 28 yards higher or lower than your target... is that possible?

We often take things as absolute when in fact tolerance stacking and precision of our tools is actually more than we assume..... gps is a great example as it been lying to me since 1994.

I never believe my gps but I believe it's pretty good!

 

[northern50]

Are you sending data to ffs via a cable or Bluetooth? The compass degree and inclination is transfered to ffs and ffs does the math for you. Otherwise with a button press or two you can get that data via the screen on your plrf. Calibrate your compass on the plrf too.

 

[joel65]

The PLRF doesn’t calculate cosine. When we use a PLRF at work, we use the distance given from the LRF and use our GPS slant-range calculator to find the cosine. If it does have a cosine function, I haven’t seen it.

 

[Greensnake]

GPS is usually only good for within 3 meters, give or take, at best. And thats with an aviation grade GPS with WAAS.

 

[deersniper]

How do you switch from meters to yards ?

 

[CoryT]

Click the azimuth key 5 times to get to the settings, cycle through options with the distance key, then 5 clicks on the azimuth key to store.
A single click of the distance key is slant range. For horizontal range click then distance key once, then press and hold it. Put the pointing circle on the object and release the distance key, horizontal range and height difference will be displayed, distance on the left and height on the right.

At least that's for the Vectors, and IIRC the PLRF c models follow the same codes. I'm searching for my 15c manual.

edit to add: Checked my manual, that's the sequence.